Engine Family · BOSCH
YC6JA Euro III / Euro V (engine-family dependent)

BOSCH 0445120164 for YC6JA

BOSCH · Control Valve F00RJ02806 (solenoid-actuated, common rail metering) · Nozzle DLLA150P1827+ (stamped, 5+ sources confirm) · 1600 bar peak rail pressure (Bosch YC6JA-class spec) peak pressure

Primary SKU 0445120164
Engine Family YC6JA
Vehicles 6 fitments
Control Valve F00RJ02806 (solenoid-actuated, common rail metering)
Nozzle Code DLLA150P1827+ (stamped, 5+ sources confirm)
Operating Pressure 1600 bar peak rail pressure (Bosch YC6JA-class spec)
View all 1 SKU → P-Code diagnostics ↓

Vehicle fitment — YC6JA

Each row is a verified fitment record from the product's published specification data.

Brand Model Engine code Years Compatible SKUs
Golden Dragon (Xiamen Golden Dragon Bus Co., Ltd.) XML6102J Yuchai YC6JA / YC6J series, 6.87-6.9L 6-cyl 132-191 kW / 180-260 hp 2010-2020s (XML6102J58S, XML6102J18Z, XML6102J15C and similar batches) 0445120164
Golden Dragon (Xiamen Golden Dragon Bus Co., Ltd.) XML6122J Yuchai YC6JA / YC6J series, 6.87-6.9L 6-cyl 132-191 kW / 180-260 hp 2010-2020s (12 m luxury coach platform) 0445120164
Higer Bus (Suzhou Higer Bus Co., Ltd.) Higer KLQ-series 8-11 m road buses Yuchai YC6JA / YC6J, 6.87-6.9L 6-cyl 132-191 kW / 180-260 hp 2010s-2020s (per chinax-balin.com cross-reference) 0445120164
King Long (Xiamen King Long United Automotive Industry Co., Ltd.) XMQ6106B / XMQ6998 Yuchai YC6J245-50 / YC6J230-30 / YC6JA series, 6.87-6.9L 6-cyl 132-191 kW 2014-present (XMQ6106BGD5 batch #274 onward) 0445120164
School bus applications 9-10 m school bus platforms (multiple OEM chassis including Golden Dragon XML6722J18C, King Long XMQ6-series) Yuchai YC6JA / YC6J, 6.87-6.9L 6-cyl 132-191 kW 2014-present (per Yuchai official application range) 0445120164
Yuchai-direct applications (medium cargo and dump trucks) 4x2 / 6x2 medium cargo truck / dump truck Yuchai YC6JA-30 / YC6JA-50 series (per Yuchai official product parameters) 2010-present (Euro III / Euro V variants) 0445120164

All BOSCH SKUs for YC6JA

Sorted by SKU. Click any card to open its full product page.

044
0445120164
F00RJ02806 (solenoid-actuated, common rail metering) · DLLA150P1827+ (stamped, 5+ sources confirm)
Compatible vehicles
XML6102J XML6122J XMQ6106B / XMQ6998 Higer KLQ-series 8-11 m road buses 4x2 / 6x2 medium cargo truck / dump truck 9-10 m school bus platforms (multiple OEM chassis including Golden Dragon XML6722J18C, King Long XMQ6-series)
Pressure
1600 bar peak rail pressure (Bosch YC6JA-class spec)
View 0445120164 →

P-Code diagnostics — YC6JA

The ECU uses these fault codes when an injector or its wiring is out of spec. Read the codes with an OBD-II scanner, then refer to the table below to identify the failing cylinder or group.

P0201–P0206
Single Cylinder Injector Fault (#1–#6)
Open or short circuit in the injector wiring harness or failed control-valve solenoid. Each code corresponds to one specific cylinder (P0201 = cylinder 1, P0202 = cylinder 2, etc.). On high-mileage diesel engines, the most common failure is the solenoid coil winding shorting due to fuel contamination past >150,000 km.
📐 Cut-out test at 1500 rpm: disable each cylinder in turn to identify the failing one.
P2146
COM1 Group Circuit Fault — Cylinders 1–3
Both P2146 (low) and P2147/P2148 (high) indicate a fault affecting the group of injectors in cylinders 1, 2, and 3 simultaneously. Usually caused by chafing in the wiring harness routed along the valve cover, or a failed injector driver in the ECU.
🔍 Inspect injector harness connector on the valve cover first — harness chafing near the cylinder head is the #1 cause on >100k km engines.
P2149
COM2 Group Circuit Fault — Cylinders 4–6
Same diagnostic approach as P2146, but affecting cylinders 4, 5, and 6 (COM2 group). Often caused by a loose injector connector at the body of cylinder 4 or 5 injector. Also check the ground strap.
🛡 Tighten the injector connector retaining clip on cylinders 4 and 5 before replacing any injectors.
P0300–P0306
Random / Specific Cylinder Misfire
Misfire detected under load or at idle. Can be caused by a faulty injector, insufficient fuel pressure, clogged nozzle, or failed glow plugs. P0300 is random misfire; P0301–P0306 are cylinder-specific. A failing control valve (low return flow) mimics misfire at low rpm.
➡ Run cylinder cut-out test first to isolate the faulty injector. Check fuel rail pressure before condemning injectors.
P0231 / P0232
Low / High Fuel Rail Pressure Circuit Fault
Rail pressure sensor circuit fault (P0231 = low, P0232 = high). Can trigger P0201–P0206 fault codes as a secondary symptom — the ECU cuts injection when rail pressure is outside safe range. Before replacing injectors, verify HP pump output and pressure regulator operation.
⚙ Measure rail pressure with diagnostic tool. Spec varies by load but rail pressure outside 300–3000 bar is suspect.
P0683 / P0684
Glow Plug Control Module Communication Fault
CAN communication fault between engine ECU and glow plug control module. Symptoms include hard cold start, white smoke on cold idle, and rough running until engine reaches operating temperature.
🔧 Replace glow plugs if >3 years old or resistance >1 Ω measured at 20 °C.

Coil resistance spec: 0.6–1.2 Ω at 20 °C. Measure at the injector plug with the harness disconnected. Out-of-range readings indicate a failed solenoid.

Installation — YC6JA

Standard procedure for common-rail diesel injectors. Always follow the OEM service manual for torque values specific to your engine code.

1
Verify before ordering — check the OE nozzle code
Remove the connector cap from the existing injector. Check the OE nozzle code stamped on the solenoid cap. Do not rely on engine code alone. The primary SKU shown above fits YC6JA only — verify by nozzle + control valve code on the old injector body before ordering.
2
Depressurise the fuel system
With engine cold, disconnect the battery, remove the HP pump fuse, and crank the engine for 5 seconds. Never crack HP fuel lines while the rail is pressurised — rail pressure can exceed 1,600 bar on common-rail diesels.
3
Remove old injector — use the correct wrenches
HP fuel line nut: 17 mm flare nut wrench (rail side). Injector-side HP line nut: 13 mm. Banjo bolt (return pipe): 13 mm deep socket. Never use an impact wrench on the injector-side nut or hold-down bolt — shock loading cracks the solenoid body.
HP banjo bolt: 9–12 N·m · with new copper washers
4
Install new injector — torque hold-down bolt
Replace all seals: new copper washers on HP banjo connections, new O-rings on low-pressure return line. Reused seals are the #1 cause of post-install fuel leaks. Check injector protrusion with a dial gauge — shim if needed so the injector sits flush with the cylinder head.
Hold-down bolt: see OEM manual (verify against OEM service manual)
5
ECU coding — IMA / Trim coding is mandatory
Each cylinder's ECU requires cylinder-specific calibration coding after installing new injectors. Use Bosch ESI[tronic] 2.0, an OEM-level scanner (e.g. BMW INPA / ISTA, MAN MAN-cats, Bosch KTS 590), or quality aftermarket (Autel MaxiSys, Launch X431). Without coding: rough idle, black smoke, and P0201–P0206 fault codes. After coding, clear all DTCs and road-test under load.
IMA coding takes 10–20 minutes per vehicle — budget time accordingly
6
Post-install verification
Run leak-back test: with engine at idle, check return flow from each injector. Spec: < 50 mL/min per cylinder at 800 bar. Excessive flow = stuck valve seat. After a 30-minute test drive, let engine cool 15 minutes and re-torque the hold-down bolt — thermal cycling relaxes clamping force 5–10%.
HP line flare nut: 25–30 N·m · banjo: 9–12 N·m
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