C5 1.6 THP Fault Codes P1336. P1337.P1339, P0087

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Brian C5
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C5 1.6 THP Fault Codes P1336. P1337.P1339, P0087

Post by Brian C5 »

Hello looking for some advice

I have a 1.6 pertrol THP Citroen C5 mileage is 45K that has been giving me cold start misfires the codes are:- P1336. P1337 (no1 cylinder), P 1339 (no 3 cylinder). I would reset them and the car would run fine apart from slight hesitation during under load. I changed the spark plugs and swapped over the coils but the misfire still was showing on No 1 & 3 cylinders.

This lasted about two weeks now a new Code has appeared P0087 Fuel circuit pressure in injector rail lower than the setting. Also me DIY scanner tells me that when in live data there is a failure to Petrol rail pressure and the reference pressure is 150 bar.

Can anyone tell me if this information is indicating that the High Pressure Fuel Pump is starting to fail?

Thanks in advance
Brian
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xantia_v6
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Re: C5 1.6 THP Fault Codes P1336. P1337.P1339, P0087

Post by xantia_v6 »

It does point towards a failing fuel pump. It might be worth checking the pressure from the feed pump in the tank (should be 5 bar I think), but if that is OK, I think you will need to try replacing the HPFP.
Brian C5
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Re: C5 1.6 THP Fault Codes P1336. P1337.P1339, P0087

Post by Brian C5 »

Thanks for getting back to me. Do you have any tips on how I check the pressure from the fuel tank pump?

Regards
Brian
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Re: C5 1.6 THP Fault Codes P1336. P1337.P1339, P0087

Post by xantia_v6 »

There should be a test point at the fuel line connector which sits above the top engine mount. Obviously you need to have a gauge of an appropriate range with the correct fitting.
Brian C5
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Joined: 16 May 2017, 09:49
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Re: C5 1.6 THP Fault Codes P1336. P1337.P1339, P0087

Post by Brian C5 »

Thanks again.