LowKeyCL600

Hello group. I have a CL600 with 127k miles. My check engine light comes on for about 2-3 days and then goes off for about 2 weeks and repeats. When the light first comes on the engine runs a little rough but when I restart it, it seems to run fine but the light stays on. I haven't had an opportunity to check to see what code comes up, just looking to see if anyone else has had this issue or something similar. I was told that I could possibly have a misfire in one of the cylinders or could be a bad sensor somewhere. Any ideas on what to check would be highly appreciated. Thank you all very much for taking the time to read my post and reply.

Plutoe

There are loads of shoulda coulda stories about she was pregnant----get a scan and post the fault codes!!

LowKeyCL600

Thanks Plutoe, I will post codes as soon as I can

LowKeyCL600

Check engine light went out (shrugs shoulders)

HangtimeDMV

Id guess a misfire if the car runs rough until you restart it. If it is it might be time to replace the spark plugs.

bennybelmont

Bit of advise whether its true or not but I did it anyway, if it is the coil packs replace the voltage Transformer too that sits on top of the engine. Only reason is apparently if you replace the coil packs and the voltage Transformer is faulty too, it can quickly break the new coil packs. Not sure if it's true or not but way I think of it is a bit like changing a timing belt and not replacing the rollers/tensioners at the same time if that makes sense?!

LowKeyCL600

Thank you Hangtime

LowKeyCL600

Thank you Benny, and yes it makes sense. I will look into it.