0445120165

Check the OE stamp on the solenoid body matches J0100-1112100-A38 (the Yuchai OEM reference for YC6J EU4). The 10-digit SKU 0445120165 should match the build plate on the original injector. The IMA calibration code is unique - cross-reference via BOSCH ESI or your Yuchai dealer for the exact match. Do NOT substitute 0445120164 (which fits YC6JA, 6.5L) - different IMA code, will trigger P0201.

F00RJ02703 is the common control valve for 0445120165 and 30+ sister SKUs in the F00RJ02703 group (including 0445120086, 087, 102, 110, 117, 127, 129, 130, 149, 150, 156, 160, 163, 164, 166, 169, 170, 182, 183, 200, 213, 214, 215, 224, 265, 289, 343). Same valve group but different IMA calibration per SKU - NOT interchangeable without ECU re-flash.

Despite both sharing the F00RJ02703 control valve, 0445120165 (YC6J EU4) and 0445120164 (YC6JA 6.5L) carry different IMA (Injection Quantity Adjustment) calibration codes. Installing 0445120164 in a YC6J application triggers P0201-P0206 fault codes and may cause over-fueling (black smoke) or hard starting. Always verify the OE number (J0100-1112100-A38 for 0445120165) and IMA code match your specific application.

Typical failures include: (1) solenoid coil open-circuit (P0201 fault) after 100,000-150,000 km; (2) nozzle coking from poor fuel quality (P0300 random misfire, black smoke); (3) control valve F00RJ02703 wear causing over-fueling; (4) injector body crack from thermal cycling; (5) high-pressure line sealing washer failure. Bus applications with frequent idle-stop cycles are particularly susceptible. Recommend replacement at 200,000 km or first symptom.

Disconnect the electrical connector, set multimeter to ohms (200 ohm range), measure across the two solenoid terminals. Normal resistance: 0.5-2.0 ohm at room temperature (cold engine, off for 30 min). Open circuit (>10 M ohm) = replace injector. Short circuit (<0.1 ohm) = replace. Always test cold for accurate reading. Note: 0445120165 uses the same solenoid family as 0445120164 but is calibrated differently.

Peak rail pressure is 1600 bar in the YC6J EU4 common rail system. Low-pressure feed must be 4-6 bar. If the rail pressure drops below 1500 bar under load, suspect a worn F00RJ02703 control valve or clogged DLLA150P2123 nozzle - replace as a set. Note: YC6J220-30 has a documented case of rail pressure dropping 200 bar below target due to undersized fuel lines (5mm instead of 8mm) - check fuel line diameter first.

Mechanical install is straightforward (15mm/17mm wrenches, 60-80 N·m torque), but ECU re-flash for the IMA calibration requires BOSCH diagnostic equipment (KTS 590 or ESI Tronic). Most workshops handle this in 2-3 hours total. Critical: use the 2-wrench procedure (15mm on solenoid, 17mm on high-pressure line) - never apply force directly to the solenoid body or you'll damage the F00RJ02703 valve.

12 months from invoice date, covers manufacturing defects and solenoid failure. Warranty does not cover damage from contaminated fuel (especially water in fuel, common in city bus applications), incorrect installation (e.g. using force on solenoid without 2-wrench procedure), or operation beyond rated pressure. Keep installation record and BOSCH diagnostic log for any warranty claim.

0445120165 is rated for Euro 4 (YC6J180-42 / 200-42 / 220-42 / 245-42). It can also be used in Euro 3 applications (YC6J180-30 / 200-30 / 220-30 / 245-30 / 270-30) because the F00RJ02703 control valve and DLLA150P2123 nozzle are shared across emission variants. For Euro 5 (YC6J180-52 / 200-52 / 220-52 / 245-52), the system adds SCR post-treatment but the injector itself is typically the same - confirm with your dealer for the exact SCR-equipped variant.