We are having a problem with a 2002 Vauxhall Omega 2.2 diesel estate, which we have owned for five years. It came with full service history and just over 100,000 miles. Its previous owner was told the head gasket had gone because it was using water, but it turned out that it was the heater valve that was leaking, so we got the car very cheaply. It’s now done about 140,000 miles.
About six weeks ago, it started cutting out. The EML would come on, then the car would become undriveable, with a misfire, cutting out and a refusal to rev. If left for a period of time, it sometimes would settle down and we could drive it home – the next day it would be fine.
The AA have been out to it twice and have read the codes. The patrol found the following fault code/system: ‘Engine control – 73L / Diesel EDC 15C4P1220 – Unknown fault’, ‘Error Message: P1345 – Unknown fault’ and ‘Error Message: find crank sensor multi-plug had water ingress, clean, ok’. There was water in the plug to the crank sensor running off the scuttle. It was then OK for two weeks, then the AA found the codes: ‘Suspect fuel injection pump fault’, ‘P1220 – START OF INJECTOR CONTROL’ and ‘P1345 ROTARY ANGLE SENSOR. Advised further investigation’.
To confirm it was the fuel pump at fault, we had a local garage look at it, but they could not find any issues. We had it back, then it died again, so I tried cleaning the filter in the fuel tank. I took out the sender unit and cleaned it, but did not find any problems. I took the car out again and it played up after about five miles. This time, I replaced the crank sensor and did 45 miles before it did the same as before. The fuel filter is about six months old, so I don’t think that will be an issue.
The Omega will still start and drive, but at some point it will play up, so we don’t want to drive it at all. We don’t want to scrap the car as we know it has been well looked after, but if it is the fuel pump then it will have to go to the scrapyard. Ray & Jackie Austin
The code ‘P1345’ is a generic code which normally indicates crankshaft and camshaft position correlation problems. However, being a generic code, this means that it can have a different meaning on different vehicles. On your Omega, the code actually refers to an injection pump sensor malfunction.
As water was found in the crank sensor, it may also be the case that water has found its way into the loom and is causing the pump sensor malfunction. This should be your first check. According to my data, your Omega should be fitted with a Bosch VP44 injection pump. This unit uses two electrically-controlled components: the fuel metering solenoid and the timing advance solenoid. These solenoids are operated by the ECM from information it receives from the sensors. The injection pump sensor (called the angular encoder by Vauxhall) is deep inside the pump and consists of a sensor wheel fixed to the pump driveshaft, so is very much part of the pump. A quick check round has given me an approximate price of £600 for a replacement pump if the wiring and connecting plug proves to be in good condition.
The Bosch VP44 Injection pump unit.