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OBD-II DIESEL WERKPLAATSPROTOCOL8-10 min read
P0266Overslag & BalansHoge Ernst💡 Motorstoringslampje brandt

P0266: Cilinder 2 opbrengst- / balansfout (Limiet looprustregeling bereikt)

Door het technisch engineeringteam van FuelPartsDBGepubliceerd: Laatst bijgewerkt: Vakgebied: Common Rail-systemen

Foutcode (DTC) P0266 geeft aan dat het motorregelapparaat (ECU/ECM) de maximale adaptieve brandstofcompensatielimiet op cilinder 2 heeft bereikt tijdens een poging om het motortoerental en de vermogensafgifte per cilinder te balanceren. In moderne common-rail dieselmotoren voert de ECU continu een looprustregeling (Smooth Running Control) uit bij stationair toerental en constante deellast. Door minieme versnellingsverschillen van de krukas tussen opeenvolgende arbeidsslagen te meten via de krukaspositiesensor (CKP), trimt de ECU de brandstofinspuiting (mg/slag of mm³/slag) per injector dynamisch bij. Als cilinder 2 structureel minder koppel levert dan het gemiddelde van de overige cilinders - door een vervuilde verstuivertip, een te hoog retourdebiet langs de doseer- of stuurklep, verminderde compressie of luchtgebrek - verhoogt de ECU de brandstofinspuiting voor cilinder 2. Zodra deze correctiewaarde de grenswaarde overschrijdt (gewoonlijk +4.5 - +6.0 mg/slag) gedurende een gedefinieerde tijd, wordt DTC P0266 opgeslagen.

🚗 BESTUURDERSGIDS & REPARATIEPROTOCOL

🚗 Rijveiligheid, geschatte reparatiekosten & verificatie

🟡 Pas op: Noodloop actief / Bezoek werkplaats
  1. 01

    🚦 Rijveiligheid en mechanisch risico

    Directe inspectie en noodzaak voor een takelwagen

    Cilinder 2 bijdrage- / balansfout - Vermogensafgifte onder fabrieksspecificatie

    De krukasversnelling van cilinder 2 blijft achter bij de overige cilinders. De ECU heeft de grenzen van de adaptiewaarden voor de rustige loop bereikt bij het compenseren van een ontoereikende brandstofinspuiting.

    MECHANISCHE RISICO'S BIJ DOORRIJDEN:Onbalans in de koppelslagen veroorzaakt trillingen in het interieur en versnelt slijtage van de demper van het tweemassavliegwiel.
  2. 02

    💰 Typisch werkplaatsbudget

    Verwachte kostenstaffels voor onderdelen en arbeid
    Klein onderhoud / Filter€ 40 - € 110: Reiniging van het dieselsysteem en vervanging van het brandstoffilter

    Sensorreiniging, brandstoffilter vervangen, zekering controleren of contacten reinigen.

    Klep / Sensor vervangen€ 180 - € 480: Vervanging van verstuiver cilinder 2 door origineel Bosch/Denso-onderdeel

    Vervanging enkel onderdeel (drukregelventiel, doseereenheid of gereviseerde verstuiver).

    Grote revisie / Pomp en injectoren€ 850 - € 2.200: Mechanische compressiediagnose van de motor of cilinderkoprevisie

    Revisie hogedrukpomp, nieuwe OEM-verstuivers of vervanging DPF-roetfilter.

    Werkplaatsreferentietarieven. Meer dan 70% van de gevallen wordt opgelost binnen niveau 1 of 2 zonder vervanging van complete subeenheden.

  4. 03

    🧰 Snelle visuele controle zonder gereedschap

    5-minuten garagecheck voordat u de werkplaats belt
    11. Lees de OBD-livedata uit voor cilinderbalanswaarden (groep 13 / 14 bij VAG, Smooth Running bij BMW).
    22. Voer een lekdebietmeting uit: een excessief retourlek op cilinder 2 bevestigt een intern hydraulisch verlies.
    33. Controleer op dieselvocht of roetlekkage rond de klembout van de verstuiver van cilinder 2.
  5. 04

    🛡️ Bescherming tegen verkeerde diagnoses

    Gerichte vragen aan de monteur om onnodige vervanging te voorkomen
    ""Bevestig de afwijking van cilinder 2 met een lekdebiettest met maatbekers voordat u de verstuiver demonteert.""
    ""Controleer de relatieve compressie over alle cilinders om uit te sluiten dat het probleem wordt veroorzaakt door een verbrande uitlaatklep in plaats van de brandstofvoorziening.""
    ""Programmeer de IMA-kalibratiecode van de nieuwe verstuiver in de ECU en reset de adaptiewaarden voor de rustige loop.""

    Technische opmerking: Stel deze gerichte vragen aan uw monteur voordat u akkoord gaat met dure reparaties:

🔧 PROFESSIONEEL TECHNICUSADVIES & REPARATIEPROTOCOLRAPID ASSESSMENT

30-seconden werkplaatstriage

Belangrijkste symptomen
  • Noticeable engine shudder, rough idling, and persistent vibration transmitting into cabin seats and steering wheel
  • Slight hesitation upon tip-in acceleration and uneven engine acoustics under steady-state cruising
  • Check Engine Light (MIL) illuminated with diagnostic trouble code P0266 stored in ECM memory
Meest waarschijnlijke oorzaken
  • Internal wear or carbon buildup on Cylinder 2 common rail fuel injector nozzle needle and spray holes
  • Excessive injector backleak (leak-off) from Cylinder 2 control valve reducing delivered fuel volume into the chamber
  • Mechanical compression deficiency in Cylinder 2 (worn piston rings, leaking intake/exhaust valve, or blown head gasket)
Eerste vereiste actie

Connect scan tool live telemetry: compare Target Fuel Rail Pressure vs Actual Rail Pressure and log metering valve command PWM duty cycle during idle and road load.

🛠️ IMA / QR-code validator

Expensive Diagnostic Pitfall & Technical Reality

❌ Veelvoorkomende werkplaatsmisvatting:

P0266 means Cylinder 2 has catastrophic mechanical piston or valve failure requiring engine block replacement ($3,500 - $6,000).

🔍 Technische en hydraulische werkelijkheid:

P0266 is an electronic Smooth Running Control limit code. The ECM measures crankshaft rotational acceleration after Cylinder 2 fires; if the required fuel trim compensation exceeds calibrated threshold limits (typically >±4.5 mg/stroke), P0266 is logged. In over 80% of verified cases, mechanical engine compression is completely sound. The root cause is an unprogrammed or incorrectly typed IMA/IQA injector calibration code, a partially clogged injector nozzle spray hole, or excessive internal control valve backleak dropping injection pressure.

💡 Technisch verificatieprotocol:

Unnecessary engine replacement ($4,000+) vs verifying and reprogramming the 7-to-20-character IMA injector code into the ECM ($0 - $50) or rebuilding the injector ($120), saving thousands.

Severe Piston Crown Torching & Flywheel Torsional Vibration Alert

CRITICAL WORKSHOP WARNING: Operating a diesel engine under an active Cylinder 2 balance fault creates violent rotational torsional vibrations that can fracture dual-mass flywheels (DMF) and strip crankshaft timing gear pins. More catastrophically, if the fault is caused by an injector nozzle sticking open or dripping, continuous unatomized diesel sprays into Cylinder 2.

MANDATORY PROTOCOL: Continuous fuel spraying creates an intense blowtorch effect that burns through the aluminum piston bowl in less than 60 seconds of driving, blowing compression directly into the engine crankcase and inducing catastrophic diesel engine runaway! If the engine runs with violent shaking or heavy white/black smoke, pull the dipstick to check for diesel fuel oil dilution and do not drive.

PLATFORM ARCHITECTURE

Meest getroffen motoren en injectieplatformen

Deze foutcode treedt hoofdzakelijk op bij de volgende common-rail dieselplatforms. Raadpleeg hieronder uw motorfamilie voor fabrieksspecificaties en onderdeelnummers:

BMW 2.0d / 3.0d (N47 / N57 / M57TU2)

Bosch CRI2.5 / CRI3.0 Common Rail

Bekende fabriekszwakte: Injector balance drift beyond +/- 4.0 mg/stroke, glow plug control unit (BERU) power lead failure, DPF backpressure accumulation.

Belangrijk onderdeel:13537805428, 0445116024, 12217801201
Bekijk technisch overzicht voor BMW 2.0d / 3.0d (N47 / N57 / M57TU2) →

Renault / Opel 1.9 dCi (F9Q)

Bosch EDC15 / EDC16 Common Rail System

Bekende fabriekszwakte: Injector harness connector diesel seepage, glow plug tip carbon seizure, EGR valve soot accumulation.

Belangrijk onderdeel:7700107165, 0445110021, 8200542997
Bekijk technisch overzicht voor Renault / Opel 1.9 dCi (F9Q) →

Volkswagen / Audi 2.0 TDI (EA189 / CFFB / CFGB)

Bosch EDC17 Common Rail System

Bekende fabriekszwakte: Piezo stack degradation, injector harness terminal fretting, DPF differential pressure sensor silicone tube split.

Belangrijk onderdeel:03L130277, 0445110369, 076906051A
Bekijk technisch overzicht voor Volkswagen / Audi 2.0 TDI (EA189 / CFFB / CFGB) →

Ford / PSA 1.6 TDCi / HDi (DV6ATED4 / DLD-416)

Bosch CRI2-16 Common Rail System

Bekende fabriekszwakte: Injector copper washer blow-by (black death), injector cylinder circuit fretting corrosion, DPF pressure pipes heat cracking.

Belangrijk onderdeel:0445110239, 1980J7, 1618LP
Bekijk technisch overzicht voor Ford / PSA 1.6 TDCi / HDi (DV6ATED4 / DLD-416) →
WORKSHOP MASTER TEARDOWN GUIDE

Cylinder Balance & Injector Deviation Guide

Common rail diesel cylinder balance & smooth running diagnostic guide. Balance rates, mg/stroke deviation, P0263 misfire, compression vs injector test.

Read Full Master Guide →
THEORY OF OPERATION

Stuurstroomcircuit & Actuatorlogica

1. Dynamic In-Demand Fuel Metering

The Smooth Running Control (SRC) system acts as an electronic flywheel balancer. In a 4-cylinder four-stroke diesel engine, each cylinder fires every 180° of crankshaft rotation. Due to manufacturing tolerances, injector wear, and mechanical friction variations, each cylinder inherently generates slightly different torque impulses. The ECM's 32-bit microcontroller records the time required for the 60-2 target wheel teeth to pass the CKP sensor during each cylinder's expansion stroke. It calculates an instantaneous speed value (RPM_cyl). The ECM then calculates the deviation of Cylinder 2 from the engine mean speed (RPM_mean) and adjusts Cylinder 2 fuel delivery.

2. Closed-Loop PID Deviation Monitoring

Under nominal engine operating conditions at operating temperature (>80°C coolant), Cylinder 2 smooth running compensation operates within -1.0 to +1.0 mg/stroke. A positive trim value (+mg/stroke) indicates a weak cylinder where the ECM is adding extra fuel to push rotational speed up. A negative trim value (-mg/stroke) indicates an overly aggressive cylinder where the ECM reduces fuel. If the ECM's internal PID controller reaches +4.5 to +6.0 mg/stroke (or -4.5 to -6.0 mg/stroke) and the speed deviation persists for over 1,000 engine cycles, P0266 is logged. Unlike P0302 (which triggers on sudden misfires), P0266 captures progressive hydraulic wear or mechanical power degradation.

3. Diagnostic Trap: Normally Open (NO) vs Normally Closed (NC) Valves

Positive vs Negative Balance Diagnostic Rule: A positive balance reading (> +3.5 mg/stroke) on Cylinder 2 points to under-delivery: injector nozzle orifice carbon restriction, internal control valve high backleak (dumping pressure to return), or low mechanical cylinder compression. A negative balance reading (< -3.5 mg/stroke) indicates over-delivery: a leaking nozzle needle seat, nozzle dribble, or an incorrect/corrupted IMA/QR calibration code telling the ECM the injector is smaller than it actually is.

ENGINEERING SPECIFICATIONS

Elektrische & Hydraulische referentiewaarden

Solenoid Coil DC ResistanceCylinder 2 Solenoid Injector: 0.20 - 0.45 Ω @ 20°C; Piezo Actuator: 180 kΩ - 220 kΩ (Capacitance: 2.5 - 3.5 µF)Measured @ 20°C across terminals 1 & 2
Insulation Resistance> 10 MΩ measured between injector terminal pins and cylinder head metal ground (tested at 250V/500V DC)Between terminals and pump body (ground)
Operating Supply VoltageECM Internal Boost Voltage: 80 V - 90 V DC (Solenoid) or 140 V - 200 V DC (Piezo); Battery supply > 12.2 VHigh-side feed from ECM / main relay
PWM Frequency StandardCrankshaft 60-2 Hall waveform with segment timing; Injector pilot, main, post current pulses (15A-25A peak)Square-wave PWM modulation
Idle Duty Cycle (Warm Engine)Cylinder 2 Smooth Running Balance (SRC): Nominal -1.5 to +1.5 mg/stroke (Limit: > +4.5 mg/stroke flags dead cylinder)Nominal baseline at 250–350 bar
Full-Load Duty Cycle (WOT)Dynamic Backleak Flow Limit: < 25 mL/min per injector @ warm idle; Relative compression variance < 10%Maximum high-speed fuel delivery demand
Low-Pressure Feed SupplyLow-pressure feed: 4.5 - 6.5 bar (electric in-tank) or -0.3 to -0.45 bar (mechanical suction pump)Measured at pump fuel inlet
Internal Cascade BackpressureStatic Compression Minimum: 22.0 - 26.0 bar per cylinder (cranking @ 250 RPM; inter-cylinder variance < 3.0 bar)Controlled by overflow cascade valve
PROCEDURAL PROTOCOL

Stap-voor-stap Werkplaatsprotocol

STEP 1

Scan Tool Smooth Running & Trim Value Analysis

Connect a diagnostic scan tool and access Engine Live Data -> Smooth Running Control (SRC) / Cylinder Balance. With the engine fully warmed (coolant > 80°C) and idling in neutral with all electrical accessories off, record the compensation values for all cylinders. Normal cylinders operate within -1.0 to +1.0 mg/stroke. If Cylinder 2 is pegged above +4.5 mg/stroke, it is severely weak. If pegged below -4.5 mg/stroke, it is severely over-delivering.

STEP 2

Verify Cylinder 2 IMA / QR Calibration Code in ECM

Navigate to ECM Special Functions -> Read Injector Configuration / IMA Codes. Read the 16-to-30 character alphanumeric calibration string stored for Cylinder 2 and physically compare it with the code laser-etched on the head of the Cylinder 2 injector. If an injector was replaced without reprogramming this code, the ECM uses incorrect voltage and pulse width duration offsets, directly triggering P0266.

STEP 3

4-Channel Dynamic Injector Backleak (Leak-Off) Test

Attach graduated measurement tubes to the fuel return nipples of all four injectors. Clamp the return hose going to the fuel tank. Start the engine and allow it to idle for exactly 2 minutes. Measure fuel quantity collected. An injector with excessive backleak (> 25-35 mL/min or double the return of adjacent injectors) suffers from an eroded ball/valve seat, losing hydraulic pressure and causing P0266.

STEP 4

Oscilloscope Cranking Relative Compression Test

Hook an oscilloscope current clamp (600A) around the starter positive cable. Disable the high-pressure fuel rail pump or disconnect injector connectors to prevent engine starting. Crank the engine for 10 seconds. Observe the rhythmic starter current draw peaks. If the peak for Cylinder 2 is more than 10% lower than the other three cylinders, the root cause is mechanical (valves, rings, cylinder bore) rather than an injector failure.

STEP 5

Physical Injector Cross-Swap Diagnostic Test

Remove Cylinder 2 injector and swap it with Cylinder 1. Always fit brand-new copper sealing washers and new stretch clamp bolts. Enter the diagnostic scanner and reprogram the IMA/QR codes to reflect the new positions of Cylinders 2 and 1. Reset smooth running adaptations. Test drive the vehicle: if the high trim value and fault code shift to Cylinder 1 (P0263), the injector is defective. If the fault stays on Cylinder 2 (P0266), the issue is mechanical or valvetrain related.

STEP 6

Intake Port Endoscopy & Valvetrain Lift Measurement

If the injector is proven healthy and relative compression is borderline, remove the intake manifold and inspect Cylinder 2 intake port for severe EGR carbon restriction. Use a dial indicator on the Cylinder 2 valve spring retainers while turning the crankshaft manually to verify that cam lobe wear has not reduced valve lift compared to other cylinders.

COMPONENT-LEVEL REPAIR

Reparatie op hardwareniveau & Onderdelenlijst

Cylinder 2 Fuel Metering Calibration & IMA Coding Architecture

Bosch CRI2 / CRI3 Solenoid Injector Assembly - Cylinder 2

0 445 110 369 / 0 445 116 059

High-precision electro-hydraulic fuel injector with laser-etched IMA calibration classification code

OEM: Protocol: Replace or recalibrate if backleak exceeds 35 mL/min or balance offset remains pegged at >±4.5 mg/stroke after coding
Heat-Treated Annealed Copper Injector Sealing Washer (1.5mm - 2.0mm)

F 00V C17 503 / OEM Copper Crush Washer

Gas-tight sealing ring preventing combustion gas leakage that drops effective cylinder compression

OEM: Protocol: Mandatory replacement whenever injector is removed
Injector Nozzle Micro-Orifice Tip Assembly (7-Hole)

DLLA 150 P 1828 / OEM Nozzle Assembly

Atomizes high-pressure diesel into micro-droplets; clogged micro-holes reduce cylinder contribution

OEM: Protocol: Replace if spray pattern testing shows distorted cone or missing spray plume
Workshop Technical & Economic Benchmark: Injector clamp stretch bolt: 7 Nm + 90° angle turn; Diagnostic scan tool capable of writing IMA/IQA 7-20 digit calibration strings; High-pressure fuel line torque: 28 - 32 Nm.
LIVE WORKSHOP TOOL

Interactieve Common Rail Tolerantiecalculator

IMA / IQA Injector Calibration Code & Checksum Validator

Validate the 7-to-20 character IMA string etched on the injector head. An incorrect character or wrong checksum causes the ECM to reject the code or default to an incorrect fuel trim curve, triggering P0266 contribution faults.

📐 Factory Engineering Tolerance: Allowable Smooth Running Trim: -1.5 to +1.5 mg/stroke
Launch Dedicated Calculator with Factory Tolerances →
OEM REPLACEMENTS

Bijbehorende brandstofinjectieonderdelen

The following genuine OEM fuel pumps and common rail injectors are verified factory equipment for engines reporting fault protocol P0266. Cross-reference operating pressures and tightening torques before sub-assembly replacement:

Common Rail Injector

0445110021BOSCH

BOSCH 0445110021 - F9Q 1.9 dCi Common Rail Injector

View Technical Specs & Fitment →
Common Rail Injector

0445110239BOSCH

0445110239 Injector: PSA 1.6 HDi Ford 1.6 TDCi Specs

View Technical Specs & Fitment →
Common Rail Injector

0445110369BOSCH

0445110369 Injector: VW 2.0 TDI EA189 CFFB CFHC Specs

View Technical Specs & Fitment →
Common Rail Injector

0445116024BOSCH

BOSCH 0445116024 Common Rail Piezo Injector for BMW N47 2.0d & N57 3.0d

View Technical Specs & Fitment →
Common Rail Injector

095000-5880Denso

095000-5880 Denso Toyota 2KD-FTV Injector: 23670-30050 Data

View Technical Specs & Fitment →
Common Rail Injector

28337917Delphi

28337917 Delphi Bobcat D24 Injector: 7030364 Specs & Data

View Technical Specs & Fitment →
CALIBRATION RELEARN

Pomp-adaptatiereset & Inleer-proefrit

Following injector replacement, cleaning, or valvetrain repair for P0266, perform the following ECM adaptation sequence:

1. In the scan tool, enter Engine Control Module -> Special Functions -> Injector IMA / QR Coding.

2. Input the exact alphanumeric calibration code printed on the top of the replacement Cylinder 2 injector.

3. Execute 'Reset Cylinder Smooth Running Adaptations' and 'Reset Mean Quantity Learning Values'.

4. Bring the engine to full operating temperature (coolant > 80°C).

5. Perform a learning road test: drive the vehicle in 4th/5th gear, accelerating to 80 km/h and allowing the vehicle to coast down to 30 km/h with foot completely off the accelerator pedal (fuel cutoff overrun). Repeat this deceleration sequence 6 times to allow the ECM to calibrate injector minimum drive pulse offsets.

DIFFERENTIAL DIAGNOSIS

Differentiaaldiagnose & Gerelateerde fouten

P0302

Cylinder 2 Misfire Detected

P0202

Cylinder 2 Injector Circuit Open / Malfunction

P0087

Fuel Rail / System Pressure Too Low

P0263

Cylinder 1 Contribution/Balance Fault

FIELD REPAIR REPORTS

Praktijkgevallen uit de werkplaats

CASE #1

2016 Ford Transit Custom 2.0 EcoBlue (Panther)(139,000 km)

Reported Complaint:Engine idle vibration with DTC P0266 logged; Cylinder 2 balance trim pegged at +4.8 mg/stroke.
Teardown Root Cause:Dynamic backleak testing: Cylinder 2 returned 65 mL in 2 minutes (Cylinders 1, 3, 4 returned 18-22 mL), confirming internal hydraulic control valve erosion.
Repair Solution:Replaced internal control valve assembly on Cylinder 2 injector, generated new 16-character IMA code on test bench, and programmed into ECM. Cylinder 2 balance trim dropped to -0.2 mg/stroke with vibration eliminated.
DIAGNOSTIC FAQ

Veelgestelde technische vragen

Wat betekent motorfoutcode P0266?

Foutcode (DTC) P0266 geeft aan dat het motorregelapparaat (ECU/ECM) de maximale adaptieve brandstofcompensatielimiet op cilinder 2 heeft bereikt tijdens een poging om het motortoerental en de vermogensafgifte per cilinder te balanceren. In moderne common-rail dieselmotoren voert de ECU continu een looprustregeling (Smooth Running Control) uit bij stationair toerental en constante deellast. Door minieme versnellingsverschillen van de krukas tussen opeenvolgende arbeidsslagen te meten via de krukaspositiesensor (CKP), trimt de ECU de brandstofinspuiting (mg/slag of mm³/slag) per injector dynamisch bij. Als cilinder 2 structureel minder koppel levert dan het gemiddelde van de overige cilinders - door een vervuilde verstuivertip, een te hoog retourdebiet langs de doseer- of stuurklep, verminderde compressie of luchtgebrek - verhoogt de ECU de brandstofinspuiting voor cilinder 2. Zodra deze correctiewaarde de grenswaarde overschrijdt (gewoonlijk +4.5 - +6.0 mg/slag) gedurende een gedefinieerde tijd, wordt DTC P0266 opgeslagen.

Wat zijn de meest voorkomende symptomen van P0266?

Noticeable engine shudder, rough idling, and persistent vibration transmitting into cabin seats and steering wheel, Slight hesitation upon tip-in acceleration and uneven engine acoustics under steady-state cruising, Check Engine Light (MIL) illuminated with diagnostic trouble code P0266 stored in ECM memory, Puffs of greyish or black soot emitted from exhaust during low-speed maneuvering and takeoff, Gradual degradation in fuel economy due to uncoordinated and excessive cylinder trim enrichment, Live scan tool data shows Cylinder 2 Smooth Running Control value pegged at +4.5 to +6.0 mg/stroke (or -4.5 mg/stroke).

Wat veroorzaakt P0266 bij een dieselmotor?

Internal wear or carbon buildup on Cylinder 2 common rail fuel injector nozzle needle and spray holes; Excessive injector backleak (leak-off) from Cylinder 2 control valve reducing delivered fuel volume into the chamber; Mechanical compression deficiency in Cylinder 2 (worn piston rings, leaking intake/exhaust valve, or blown head gasket); Incorrect, unprogrammed, or corrupted IMA/QR calibration code entered in the ECM for Cylinder 2; Carbon sludge accumulation in the intake swirl port or runner dedicated to Cylinder 2; Damaged or worn hydraulic valve lifter, rocker arm, or camshaft lobe on Cylinder 2.

Is het veilig om te rijden met actieve code P0266?

🟡 Pas op: Noodloop actief / Bezoek werkplaats

Wat kost het repareren van foutcode P0266?

De gemiddelde reparatiekosten voor storingscode P0266 hangen af van de exacte oorzaak en het diagnoseniveau: Niveau 1 (Klein onderhoud / Doe-het-zelf): € 40 - € 110: Reiniging van het dieselsysteem en vervanging van het brandstoffilter (Sensorreiniging, brandstoffilter vervangen, zekering controleren of contacten reinigen.); Niveau 2 (Vervanging onderdeel): € 180 - € 480: Vervanging van verstuiver cilinder 2 door origineel Bosch/Denso-onderdeel (Vervanging enkel onderdeel (drukregelventiel, doseereenheid of gereviseerde verstuiver).); Niveau 3 (Revisie hoofdsysteem): € 850 - € 2.200: Mechanische compressiediagnose van de motor of cilinderkoprevisie (Revisie hogedrukpomp, nieuwe OEM-verstuivers of vervanging DPF-roetfilter.). Werkplaatsreferentietarieven. Meer dan 70% van de gevallen wordt opgelost binnen niveau 1 of 2 zonder vervanging van complete subeenheden.

What is the difference between DTC P0302 and DTC P0266?

P0302 is an active misfire code triggered when the crankshaft decelerates sharply during Cylinder 2's power stroke (combustion failure). P0266 is a fuel trim adaptation code triggered when the ECM has continuously adjusted Cylinder 2's fuel quantity to the absolute limit (+4.5 to +6.0 mg/stroke) in an attempt to balance idle speed, but the cylinder still contributes uneven torque.

Can bad fuel cause P0266 on only one cylinder?

Usually bad fuel affects all injectors. However, if water or fine particulates were present, the injector closest to the rail inlet or the injector with the smallest manufacturing tolerances may foul or experience valve scuffing first, leading to P0266 isolated to Cylinder 2.

Will reprogramming the IMA code fix P0266 if the injector is not replaced?

If an incorrect IMA code was previously entered (e.g., during previous repair), writing the correct code can resolve P0266. However, if the code already matches the injector head, P0266 indicates physical hydraulic wear or carbon clogging that cannot be solved by re-entering the existing code.