BOSCHFUEL INJECTORS (CRI / GDI)
0445110021
Renault F9Q 1.9 dCi (1870 cc)
Peak Pressure:1600 bar peak rail pressure
Associated Fault Codes:
Diesel Engine Diagnostic Trouble Codes (DTC)
Industrial-grade troubleshooting guides, electrical pinout tests, and root-cause analysis for common rail fuel injection, EGR, DPF, and turbocharger faults.
WORKSHOP SUBSYSTEM HUBS
Industrial Power Subsystems & Diagnostic Hubs
Direct workshop access to mechanical failure root causes, electrical circuit schematics, and factory component references.
HIGH-PRESSURE PUMPS (HPFP / CP)
High-Pressure Fuel Supply Pumps
Mechanical supply loss, roller tappet wear, metering valve (MPROP) sticking, and acute rail pressure drops.
FUEL INJECTORS (CRI / GDI)
Common Rail & Direct Fuel Injectors
Control valve wear causing excessive backleakage, solenoid coil short circuits, and individual cylinder misfires.
PRESSURE SENSING & REGULATION
Fuel Rail Pressure Sensors & Relief Units
Piezoresistive signal voltage drift, 5V reference short circuits, and mechanical PRV valve premature relief.
VERIFIED REPLACEMENT ASSEMBLIES
High-Incidence Fault Resolution Assemblies
Factory OEM fuel pumps and common rail injectors verified for recurring rail pressure and misfire trouble codes. Compare engineering tolerances and technical specifications:
BOSCHFUEL INJECTORS (CRI / GDI)
0445110036
PSA DW12 / DW12TED4 (2.2 HDi 4HX / 4HW)
Peak Pressure:1600 bar peak
Associated Fault Codes:
BOSCHFUEL INJECTORS (CRI / GDI)
0445110137
Mercedes-Benz OM646 / OM647 / OM648 CDI (2.2L & 2.7L)
Peak Pressure:1,600 bar peak
Associated Fault Codes:
BOSCHHIGH-PRESSURE PUMPS (HPFP / CP)
0261520288
Volkswagen / Audi EA888 Gen 3 & Gen 3B (1.8L & 2.0L TSI / TFSI CHHB / CJXC / CYFB)
Peak Pressure:200 bar
Associated Fault Codes:
BOSCHHIGH-PRESSURE PUMPS (HPFP / CP)
0261520521
BMW B38 / B48 / B58 Modular TwinPower Turbo (1.5L / 2.0L / 3.0L & TU)
Peak Pressure:350 bar
Associated Fault Codes:
KEIHINHIGH-PRESSURE PUMPS (HPFP / CP)
16790-59B-004
Honda 1.5L Earth Dreams VTEC Turbo & i-VTEC (L15B7 / L15BA / L15BE / L15B2)
Peak Pressure:200 bar
Associated Fault Codes:
P0300: Random or Multiple Cylinder Misfire Detected
Diagnostic Trouble Code (DTC) P0300 indicates that the Engine Control Module (ECM/PCM) has detected random, intermittent, or multiple cylinder combustion misfire events across more than one engine cylinder. In a diesel engine-which lacks spark plugs and relies strictly on compression ignition-misfire detection is computed solely by the Crankshaft Position (CKP) sensor measuring sub-microsecond changes in crankshaft angular acceleration after each cylinder's Top Dead Center (TDC) firing stroke. If multiple cylinders fail to deliver the expected rotational torque impulse, or if combustion instability jumps randomly between cylinders exceeding calibrated percentage thresholds (typically >2.0% of total combustion cycles), P0300 is registered.
Common Rail Injector / Copper Sealing Washer 💰 Est. $60 - $250 🚗 7 Platforms (Bosch HDEV-5 GDI, Bosch HDEV-5 N20/N55) ⚠️ Limp Mode Active 💡 MIL Warning
P0299: Turbocharger / Supercharger 'A' Underboost Condition
Diagnostic Trouble Code (DTC) P0299 indicates that the Engine Control Module (ECM/PCM) has detected that actual manifold boost pressure (MAP) is substantially lower than commanded target boost pressure under load. The ECM continuously compares target boost against real-time signals from the Manifold Absolute Pressure (MAP) and Mass Air Flow (MAF) sensors. If actual boost lags behind requested setpoint by more than 250-400 mbar (3.6-5.8 psi) for a calibrated duration of 4 to 8 consecutive seconds under engine load, P0299 is stored and the vehicle is forced into Limp-Home mode (derate) to prevent exhaust gas temperature (EGT) thermal runaway.
Turbocharger Actuator / Intercooler Boost Hose 💰 Est. $45 - $120 🚗 4 Platforms (Garrett VNT / Continental Variable Geometry Turbo, BorgWarner BV43 / Garrett GTB1749V Common Rail Turbo) ⚠️ Limp Mode Active 💡 MIL Warning
P0301: Cylinder 1 Misfire Detected
Diagnostic Trouble Code (DTC) P0301 indicates that the Engine Control Module (ECM/PCM) has detected a complete combustion failure or recurring misfire condition isolated specifically to Cylinder 1. In a common rail diesel engine-which has no spark ignition system-misfire detection is computed solely by the high-resolution Crankshaft Position (CKP) sensor monitoring sub-microsecond variations in crankshaft angular velocity. When Cylinder 1's power stroke (30° to 90° After Top Dead Center / ATDC) produces a rotational deceleration dip rather than an acceleration spike exceeding calibrated thresholds (typically >2.0% of monitored combustion events), P0301 is stored.
Common Rail Injector / Copper Washer 💰 Est. $25 - $180 🚗 5 Platforms (Bosch HDEV5.2 GDI, Bosch Solenoid HDEV5 GDI) ⚠️ Limp Mode Active 💡 MIL Warning
P0101: Mass or Volume Air Flow Sensor 'A' Circuit Range/Performance
Diagnostic Trouble Code (DTC) P0101 indicates that the Engine Control Module (ECM/PCM) has detected a plausibility, range, or performance error in the primary Mass Air Flow (MAF) sensor circuit. In modern diesel engines, the MAF sensor (hot-film air-mass meter / HFM5 / HFM6 / digital frequency sensor) provides the primary input for exhaust gas recirculation (EGR) mass flow calculation, turbocharger boost plausibility, and smoke-limiter fuel injection quantity. DTC P0101 is triggered when the measured airflow signal deviates by more than 20% to 30% from the ECM's internal speed-density calculation model (derived from RPM, MAP, IAT, and volumetric efficiency) for more than 4 to 6 consecutive seconds.
Mass Air Flow (MAF) Sensor / Air Intake Duct 💰 Est. $15 - $110 🚗 4 Platforms (Bosch EDC17 / Continental MAF, Bosch EDC17 / MAF Sensor) ⚠️ Limp Mode Active 💡 MIL Warning
P0087: Fuel Rail/System Pressure Too Low
The Engine Control Module (ECM) detects that common rail fuel pressure has dropped significantly below target operating setpoint under current engine load.
Common Rail Injector / High-Pressure Fuel Pump 💰 Est. $35 - $180 🚗 8 Platforms (Bosch HDP-5 GDI, Bosch HDP-6 Gen 2 GDI) ⚠️ Limp Mode Active 💡 MIL Warning
P0302: Cylinder 2 Misfire Detected
Diagnostic Trouble Code (DTC) P0302 indicates that the Engine Control Module (ECM/PCM) has detected a complete combustion failure or recurring misfire condition isolated specifically to Cylinder 2. In a common rail diesel engine-which has no spark ignition system-misfire detection is computed solely by the high-resolution Crankshaft Position (CKP) sensor monitoring sub-microsecond variations in crankshaft angular velocity. When Cylinder 2's power stroke (30° to 90° After Top Dead Center / ATDC) produces a rotational deceleration dip rather than an acceleration spike exceeding calibrated thresholds (typically >2.0% of monitored combustion events), P0302 is stored.
Common Rail Injector / Copper Sealing Washer 💰 Est. $30 - $180 🚗 4 Platforms (Delphi CRD2 / CRD3 Common Rail System, Bosch EDC15 / EDC16 Common Rail) ⚠️ Limp Mode Active 💡 MIL Warning
P0304: Cylinder 4 Misfire Detected
Diagnostic Trouble Code (DTC) P0304 indicates that the Engine Control Module (ECM/PCM) has detected a complete combustion failure or recurring misfire condition isolated specifically to Cylinder 4. In a common rail diesel engine-which has no spark ignition system-misfire detection is computed solely by the high-resolution Crankshaft Position (CKP) sensor monitoring sub-microsecond variations in crankshaft angular velocity. When Cylinder 4's power stroke (30° to 90° After Top Dead Center / ATDC) produces a rotational deceleration dip rather than an acceleration spike exceeding calibrated thresholds (typically >2.0% of monitored combustion events), P0304 is stored.
Common Rail Injector / Hold-Down Clamp Bolt 💰 Est. $30 - $180 🚗 4 Platforms (Bosch CRI2 Solenoid, Delphi CRD2 / CRD3 Common Rail) ⚠️ Limp Mode Active 💡 MIL Warning
P0303: Cylinder 3 Misfire Detected
Diagnostic Trouble Code (DTC) P0303 indicates that the Engine Control Module (ECM/PCM) has detected a complete combustion failure or recurring misfire condition isolated specifically to Cylinder 3. In a common rail diesel engine-which has no spark ignition system-misfire detection is computed solely by the high-resolution Crankshaft Position (CKP) sensor monitoring sub-microsecond variations in crankshaft angular velocity. When Cylinder 3's power stroke (30° to 90° After Top Dead Center / ATDC) produces a rotational deceleration dip rather than an acceleration spike exceeding calibrated thresholds (typically >2.0% of monitored combustion events), P0303 is stored.
Common Rail Injector / Copper Washer 💰 Est. $30 - $180 🚗 4 Platforms (Bosch CRI2.2 Solenoid / CRI3 Piezo, Bosch CRI3 Piezo Common Rail System) ⚠️ Limp Mode Active 💡 MIL Warning
P0401: Exhaust Gas Recirculation (EGR) Flow Insufficient Detected
The ECM opens the EGR valve but does not observe the expected drop in Mass Air Flow (MAF) or expected change in MAP/intake temperature, indicating insufficient exhaust gas recirculation flow.
EGR Valve / EGR Cooler 💰 Est. $20 - $180 🚗 4 Platforms (Continental / Bosch Dual-Loop EGR, Denso / Continental) 💡 MIL Warning
P0403: Exhaust Gas Recirculation (EGR) Control Circuit Malfunction
Diagnostic Trouble Code (DTC) P0403 indicates that the Engine Control Module (ECM/PCM) has detected an electrical fault or circuit continuity failure within the dedicated drive circuit of the Exhaust Gas Recirculation (EGR) valve solenoid or electric DC actuator motor. In modern diesel emissions architectures, the ECM commands EGR actuation using a pulse-width modulated (PWM) low-side or H-bridge driver circuit. The ECM continuously monitors circuit resistance, driver voltage drop, and inductive flyback voltage signatures during operation. If an open circuit, high internal resistance, severed wiring harness, or short circuit is detected when the driver is activated or de-energized, DTC P0403 is immediately logged and EGR functionality is disabled.
EGR Valve with Motor / Harness Connector 💰 Est. $20 - $140 🚗 4 Platforms (Valeo Electronic EGR & Cooler Module, Valeo Stepper Motor EGR System) 💡 MIL Warning
P0193: Fuel Rail Pressure Sensor 'A' Circuit High
Diagnostic Trouble Code (DTC) P0193 indicates that the Engine Control Module (ECM/PCM) has detected that the input voltage signal from the Fuel Rail Pressure (FRP) sensor has exceeded the calibrated high electrical threshold (typically >4.88 V to 4.95 V, corresponding to a virtual pressure reading over 2200 to 2500 bar) for longer than 0.2 to 0.5 consecutive seconds. Because a sensor reading pinned at maximum voltage indicates an imminent hydraulic overpressure risk, the ECM activates protective failsafe strategies, defaulting to fixed limp-mode pressure maps, limiting engine torque, or inhibiting engine starting entirely to prevent rail mechanical rupture.
Fuel Rail Pressure Sensor 💰 Est. $30 - $85 🚗 5 Platforms (Hitachi Dual GDI 200 bar, Hitachi EA839 GDI 250 bar) ⚠️ Limp Mode Active 💡 MIL Warning
P2002: Diesel Particulate Filter (DPF) Efficiency Below Threshold (Bank 1)
Diagnostic Trouble Code (DTC) P2002 indicates that the Engine Control Module (ECM/PCM) has detected that the Diesel Particulate Filter (DPF) on Bank 1 is failing to trap and hold exhaust soot particulate matter at calibrated efficiency levels. The DPF substrate is designed to capture >98% of harmful diesel soot particles. The ECM continuously audits DPF filtering efficiency by comparing real-time exhaust backpressure readings from the DPF Differential Pressure Sensor (DPS / Delta-P) against an internal mathematical soot accumulation model, cross-referenced with downstream Particulate Matter (PM) or NOx sensor data. If differential pressure remains abnormally low under sustained load (indicating exhaust gas is bypassing the filter), or if downstream soot sensors detect particulate spikes (>5 mg/m³), P2002 is stored.
Diesel Particulate Filter (DPF) / DPF Differential Pressure Sensor 💰 Est. $30 - $120 🚗 4 Platforms (Bosch EDC17 DPF System, Continental / Bosch DPF) ⚠️ Limp Mode Active 💡 MIL Warning
P0089: Fuel Pressure Regulator 1 Performance
Diagnostic Trouble Code (DTC) P0089 indicates that the Engine Control Module (ECM/PCM) has detected a performance, stability, or response rate fault in the high-pressure fuel pressure regulation circuit. The high-pressure fuel rail contains either an Inlet Metering Valve (IMV / MPROP / SCV) on the high-pressure pump, a Rail Pressure Control Valve (PCV) on the common rail, or a dual-valve balancing system. DTC P0089 triggers when the ECM closed-loop PID controller detects continuous, uncontrolled rail pressure oscillations (hunting/surging exceeding ±50 to ±150 bar), excessive duty cycle deviation to maintain target pressure, or an inability to stabilize fuel pressure within calibrated response time limits.
Inlet Metering Valve (IMV) / Fuel Pressure Regulator 💰 Est. $35 - $160 🚗 5 Platforms (Bosch HDP-5 Roller, Bosch HDP-6 GDI) ⚠️ Limp Mode Active 💡 MIL Warning
P0234: Turbocharger / Supercharger 'A' Overboost Condition
Diagnostic Trouble Code (DTC) P0234 indicates that the Engine Control Module (ECM/PCM) has detected that actual manifold boost pressure (MAP) has exceeded the commanded target boost pressure by a calibrated threshold (typically >350 to 500 mbar / 5.0 to 7.2 psi) for longer than 2.5 to 5.0 consecutive seconds. Overboost is a high-severity fault: excessive charge-air pressure forces peak cylinder pressures (Pmax) beyond structural engine limits, risking head gasket failure, stretched cylinder head bolts, intercooler rupture, and turbine wheel centrifugal burst. The ECM immediately triggers a protective Limp-Home mode, cutting fuel injection duration and zeroing boost request.
Turbocharger VNT Actuator / N75 Boost Solenoid 💰 Est. $30 - $140 🚗 4 Platforms (Garrett GTC1446VZ / BorgWarner VNT, Garrett GT1544V Variable Geometry) ⚠️ Limp Mode Active 💡 MIL Warning
P0380: Glow Plug / Heater Circuit 'A' Malfunction (Primary Circuit Failure)
Diagnostic Trouble Code (DTC) P0380 indicates that the Engine Control Module (ECM/PCM) has detected an electrical malfunction, continuity failure, or excessive resistance in the primary glow plug heating circuit 'A' or its high-current supply relay. In diesel engines, glow plugs provide essential auxiliary thermal energy to preheat the compressed combustion chamber air to over 850°C-1,000°C during cold starts and the immediate post-start warm-up phase. DTC P0380 is a system-wide parent code triggered when the ECM senses that the primary glow plug power feed has zero voltage (blown maxi-fuse), the main glow relay control coil has an open or short circuit, or the total current draw across the common glow plug busbar is severely lower than calibrated thresholds during pre-heating.
Diesel Glow Plug / Glow Plug Control Relay 💰 Est. $15 - $80 🚗 4 Platforms (Beru / Bosch Instant Glow System (ISS), Bosch / Beru 5V-7V Low Voltage Plugs) 💡 MIL Warning
P0191: Fuel Rail Pressure Sensor 'A' Circuit Range/Performance
Diagnostic Trouble Code (DTC) P0191 indicates that the Engine Control Module (ECM/PCM) has detected a plausibility, range, or rate-of-change performance fault in the Fuel Rail Pressure (FRP) sensor signal. Unlike hard circuit faults (P0192/P0193) where signal voltage is pinned to 0V or 5V, P0191 indicates the sensor voltage is electrically within the valid operating window (0.5V to 4.5V) but fails internal mathematical rationality tests. Common triggers include a zero-pressure offset drift with Key-ON Engine-OFF (sensor reads >50 bar when pressure is zero), abnormal pressure decay slopes during deceleration fuel cut-off (DFCO), or an inability of the signal to respond dynamically to commanded pressure changes within calibrated time windows.
Fuel Rail Pressure Sensor / Fuel Rail Assembly 💰 Est. $25 - $120 🚗 4 Platforms (Ford Super Duty F-250 / F-350 (2011-2023), BMW E90 / F30 320d, E60 / F10 530d, X3 / X5 3.0d) ⚠️ Limp Mode Active 💡 MIL Warning
P0238: Turbocharger / Supercharger Boost Sensor 'A' Circuit High
Diagnostic Trouble Code (DTC) P0238 indicates that the Engine Control Module (ECM/PCM) has detected that the electrical voltage signal from the Manifold Absolute Pressure (MAP) / Boost Pressure Sensor 'A' has exceeded the maximum calibrated upper threshold (typically > 4.75V to 4.85V DC) for a duration exceeding calibrated monitor debounce limits. In common rail turbo-diesel engines, maximum full-boost sensor voltage under peak load never exceeds 4.50V. When the voltage surges above 4.75V, the ECM interprets this as an electrical circuit failure-primarily caused by an open sensor ground return wire, an internal short between the 5V reference and signal circuits, or an external short to battery voltage (12V). In response, the ECM immediately cuts boost and commands Limp-Home mode.
MAP Sensor 💰 Est. $25 - $85 🚗 4 Platforms (Volkswagen Golf / Passat / Tiguan, Audi A3 / A4 / Q5 2.0 TDI, Ford Focus / Fiesta / C-Max, Peugeot 207 / 308 1.6 HDi) ⚠️ Limp Mode Active 💡 MIL Warning
P0201: Injector Circuit Malfunction - Cylinder 1
ECM detects an open circuit, short circuit, or abnormal current draw on Cylinder 1 fuel injector solenoid or piezo actuator.
Common Rail Injector / Nozzle & Valve Assembly 💰 Est. $25 - $120 🚗 4 Platforms (Bosch Solenoid CRI, Bosch CRI2 / CRI3) ⚠️ Limp Mode Active 💡 MIL Warning
P2463: Diesel Particulate Filter (DPF) Restriction - Soot Accumulation
Diagnostic Trouble Code (DTC) P2463 indicates that the Engine Control Module (ECM/PCM) has detected that the Diesel Particulate Filter (DPF) has reached a critical, excessive soot accumulation threshold (typically >40 to 45 grams of soot, or differential pressure exceeding 250 to 300 mbar under sustained engine load). At this severe restriction level, exhaust backpressure causes high thermal and mechanical stress on the turbocharger and engine valves. For fire safety, the ECM automatically locks out all automated on-road active regeneration cycles to prevent runaway DPF fires, enters high-severity Limp-Home Mode, and illuminates the DPF warning lamp alongside the Check Engine MIL.
Diesel Particulate Filter (DPF) / Common Rail Injector 💰 Est. $60 - $250 🚗 4 Platforms (Ford Super Duty F-250 / F-350 / F-450 (2011-2023), Volkswagen Golf / Passat / Tiguan, Audi A3 / A4 / Q5 2.0 TDI) ⚠️ Limp Mode Active 💡 MIL Warning
P0404: Exhaust Gas Recirculation (EGR) Control Circuit Range/Performance
Diagnostic Trouble Code (DTC) P0404 indicates that the Engine Control Module (ECM/PCM) has detected a performance, range, or response rate fault in the Exhaust Gas Recirculation (EGR) valve actuator circuit. In modern electronic EGR systems, the ECM continuously commands the valve to precise opening angles (0% to 100%) and monitors physical position feedback from an integrated Hall-effect sensor or dual-track potentiometer. DTC P0404 is stored when actual valve position deviates from commanded target position by more than 15% to 20% for longer than 2.0 to 4.0 consecutive seconds, or when the valve fails to complete its automated spring-return end-stop self-calibration sequence upon ignition key-off.
EGR Valve / EGR Position Sensor 💰 Est. $40 - $150 🚗 4 Platforms (Ford Focus / Fiesta / Transit Connect, Peugeot 207 / 308 1.6 HDi, Volkswagen Golf / Passat / Tiguan, Audi A4 / Q5 2.0 TDI) 💡 MIL Warning