P1191 code on Z22YH and leak on fuel pipe union.

Dande

Member
Hey guys,

So I bought this 07 Zafira about 10 months ago. Shortly after It had a misfire on cylinder 2. Changed spark plugs and all seemed good until last week when I had a misfire on cylinder 3 this time and also the EML light came on.

After restarting the car the fault would normally go away, but I could get it to come back by accelerating hard in 3rd gear. I changed coil packs and plugs as advised even though I wasn't convinced it was that.

So when doing that now it does a quick jolt hesitation and then carries on as normal. Sometimes the spanner/car light come on.

I plugged in Op-com today to record the live data and there was a P1191 fault code. I went for a drive to try and replicate the fault and recorded the data which I have attached. Close to line 21210 the pressure drops to 1 even though 9.5 is requested. It also has a small leak by the fuel pipe union where it connects to the pump. I will attach a picture of that also.

Could this leak cause this problem? How can I fix the leak? Shall I simply try tightening the union first?

Any help would be really appreciated as I am a level 3 automotive student and I have a young family that relies on me to get them around.

Thanks in advance.

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