Citroen C5 1.6 THP Petrol 2012 Engine Management Light On

[Brian C5]

Hello
I wonder if someone can help me with this fault?. Started the car from cold the engine it was a little lumpy at first but idled ok. Then the engine Management fault light came on and the radiator electric cooling fan came on at full speed. I switched the engine off but the cooling fan stayed on for a least ten minutes even though the engine was cold.
I know I need to get a code reader to tell me what has been logged as a fault but would I be right in thinking it could be a faulty coolant senor in the thermostat housing. Although I woundn't know which one it is as there are two!

I have read in Mini forums (same engine) this could be the problem.

Any help would be appreciated.
Brian

[xantia_v6]

Those are pretty much the symptoms I had a week ago when a coil pack failed. If the engine is running rough with no power, I would suspect an ignition coil.

After replacing a coil, the engine ran fine and the fan behaved itself, but the EML did not go off until the fault code was cleared from the ECU.

[Brian C5]

Thanks for the reply. The engine was a little lumpy when it first started but ran fine after about 30 seconds. Also the radiator fan came on right away and and stayed on even when I turned the cold engine off. This has never happened before. I would have thought if a coil was faulty that this would make no differnce to the fan coming on!

I will try and get a local garage to put a fault code reader on to it rather than pay the main Citroen dealer who wants 90 pounds for this!!

Thanks for your advice
Brian

[xantia_v6]

The fan comes on at full speed as soon as a serious engine fault of any kind is detected. You really can't do anything until you have some fault codes to work with. For a serious engine fault like this you should get a fairly good initial diagnosis from a generic reader, but if the fault still isn't obvious, then you may need to find someone with a Diagbox tool.

[Brian C5]

Thanks
I will do this and let you know how I get on.

[Brian C5]

Hello Xantia_v6

I took the C5 to a local garage for them to do a dianostic check to see what fault codes had been logged. Before doing this I unplugged the electric fan as it runs constantly at high speed.

The following two fault codes were found under "Engine Management":-

Code P1336 Combustion Misfiring (impact On Catalytic Converter) : Cylinder Undertermined
Code P1338 Combustion Misfiring (Impact On Catalytic Converter) : No 2 Cylinder.

The garage cleared the codes and the car got me home 3 miles away without the fault re-ocurring.

So your advice was spot on. Tomorrow I will get a new coil for number 2 cylinder and a new set of spark plugs (the originals have done 30 thousand miles) and hopefully there will no more problems.

There are only two additional things I need to know

1. What is cylinder is No1. Is it the flywheel/gearbox end ?

2. Do you know by chance who makes the coils for Citroen (Bosh, Delphi) as I can get them fo a good price compared to Citroen.

Once again many thanks for your help on this matter.

Brian

[xantia_v6]

Cylinder 1 appears to be at the flywheel end.
The original coils on my car were made by Delphi.

[Brian C5]

Thanks again
Brian

[Brian C5]

Hello Xantia-v6

Changed the spark plugs and replaced the coil (with a Citroen one) on number two cylinder. Have done about 80 miles with no problems.


Thanks again for your help
Brian

[renel]

Cylinder 1 appears to be at the flywheel end.
The original coils on my car were made by Delphi.

Strangely , I have asked some people where is no.1 cylinder? on my C4Picasso B78 1.6thp 2015. Seems that it is a puzzle, Brian C5 found, as mensioned inhere, 1 is at the flywheel end! Well when I have my scanner connected e.g. on injection timing, I find a difference in value on cyl. no 1, at the chain end!!
I know this is the Citroen way, owner since 20+ years, but since this engine also is used in BMW and MINI, question is, have they adopted the C way or do they have it as many other do, in the chain side? Refer to my start post?..