Vehicle system
Fuel Injection and Fuel Pressure Codes
Codes for the circuits that deliver the fuel: injectors, the fuel pump and its relay, fuel rail pressure sensors and, on turbocharged engines, boost pressure control.
Most of them are electrical codes: the computer monitors the current through each injector and the signal from the pressure sensors. On common rail diesels and gasoline direct injection engines the working pressure is very high, so out-of-range pressure codes deserve quick attention.
Most searched codes in this system
- P0201 to P0208: injector circuit for each cylinder.
- P0087 and P0088: fuel rail pressure too low or too high.
- P0191 to P0193: fuel rail pressure sensor.
- P0230: fuel pump primary circuit.
- P0299 and P0234: turbo underboost or overboost.
What to check first
- Inspect the injector connectors and wiring, especially where they are exposed to heat.
- Measure the real fuel pressure with a gauge and compare it with what the sensor reports.
- Replace the fuel filter if you do not know how old it is.
- On turbo engines, look for leaks in the hoses and intercooler before blaming the turbocharger.
All codes in this system
103 codes, page 1 of 2