Cause
Fuel contamination
The wrong fuel, water, or debris in the tank. Misfuelling is the case worth asking about directly, because the symptoms arrive suddenly and completely and the owner usually knows exactly when — and on a diesel, water removes the only lubricant the high-pressure pump gets, so the damage travels downstream into the injectors.
Typically specialist work. Needs equipment or training most home workshops do not have.
Some of these codes mean you should stop driving
4 of the 9 codes this can cause indicate a fault where continuing to drive risks damage or is unsafe. Which one you have matters more than the cause does — read the code's own page before deciding.
Codes this can cause (9)
Codes where this is a likely explanation first, rather than merely a possible one.
- P0169 Incorrect Fuel Composition Likely for this code Moderate
- P0177 Fuel Composition Sensor Circuit Range/Performance Likely for this code Moderate
- P0251 Injection Pump Fuel Metering Control A — Cam/Rotor/Injector Likely for this code Stop driving High
- P0252 Injection Pump Fuel Metering Control A Range/Performance (Cam/Rotor/Injector) Likely for this code Stop driving High
- P0256 Injection Pump Fuel Metering Control B (Cam/Rotor/Injector) Likely for this code Stop driving High
- P0257 Injection Pump Fuel Metering Control B Range/Performance (Cam/Rotor/Injector) Likely for this code Stop driving High
- P2371 Fuel Volume Regulator B Control Circuit Performance Likely for this code Moderate
- P2A40 Alternative Fuel System - Injector Leakage to Rail Detected Likely for this code High
- P0089 Fuel Pressure Regulator A Performance High
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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