Quote:
Originally Posted by TomUK
UPDATE: Used the vehicle for months without any issues, but the warning light remained lit throughout. MOT time came along and placed a discreet strip of black tape over the light.
Car Passed the MOT without incident, emissions ok. ODB Code Reader received at Christmas useful present!). Three codes detected.P0304 (Misfire all cylinders), P0711 (transmission fluid temp.), P1B00 (Undefined?).
Regarding the misfire code, the engines runs normally under acceleration, normal cruising and smooth idling. I suppose transmission fluid temp. could be faulty sensor.
I erase the fault codes and switch MIL (warning light) to OFF and car runs for a couple of days without light re-appearing. Then out of the blue, it lights up again.
I am thinking about changing the coil pack, but with the car running fine, I wonder whether this is necessary. Any one else had similar trouble?
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P0304 is specific to cylinder number 4. Misfire on all cylinders is P0300. Your MOT certificate may indicate a misfire this if they supplied you with an emissions sheet because every time the car misfires, the ppm will go up by 1 - providing it's not burning any oil! These engines run really clean when in good order. Your ppm limit is 200, if it shows 100 or something, there is a misfire or burning oil etc and would still result in a pass.
The other 2 codes point to a potential ECU fault. There are no transmission temperature sensors. Could just be a spurious error. Some codes are allowed to be set by the manufacturer. In which case you need PP2000/Lexia/Diagbox to read the correct definition of the codes supplied as a generic reader (such as ELM etc) won't be giving you the correct definitions.
Anyways, going back to your misfire code, that triggers when the ECU detects a certain number of misfires over a period of time - you won't necessarily feel them.