HPFP misdiagnosis? Or something else

[Dxniell]

Hi all, first post to this forum but I’m looking for help regarding my 2013 1.6THP pug 308.

Around 1 month ago, I had an EML with two separate misfires which a garage diagnosed as spark plugs, these were changed and the car was fine for around a week.

The EML light then came back on, fault codes P0087 and P0172 this time around, 5-6 different independent garages looked at my car over a period of 2 weeks and not a single one was able to accurately diagnose my issue. Eventually, I caved and took it to the main dealer who for the small price of £180 diagnosed it as a faulty HPFP which they quoted me £1300 for, I had the HPFP replaced today at an independent garage for £900, everything was fine for around 15 miles, until I now have the EML light back on, car back in limp mode, with a new fault code of P0088, stating that the fuel pressure is now too high instead of the P0087 (pressure too low) that I had before.

the car is only on 43,000 miles, it had a new timing chain tensioner before I purchased it at around 38,000, it was serviced on 39,000 miles and then again at 42,500 miles. Does anyone have any ideas what could be causing my issue?

[xantia_v6]

I don't have experience of that fault, but I think that diagnosis requires inspecting the live engine parameters, not just the fault codes. It could be the pressure sensor or the pump, or the wiring to either.

[Dxniell]

The RAC came out yesterday and checked the live fuel pressure readings that all seemed to be within parameters.

He was sure that maybe the fuel line had air / a kink in it from the garage fitting the new HPFP that could’ve been causing a buildup of pressure.