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asad7860

Active Member
Joined
Apr 29, 2008
Messages
117
Location
UK
Car
E55 W211
Hi everyone

I put a post on here about 1 month ago. It was about the yellow check engine light.

"Hi all

Was driving home last night a yellow check engine light came up on the dashboard - (the light looks like an engine).

Car is fine. Still very responsive. Light still on today.

any ideas"

I got a few helpful replies and went to an independent Specialist in Stockport to have it looked at.

The car was wired up and it appeared that the secondary air pump was at fault. So this was replaced along with the relay. Parts were pricey - £210 + vat for the air pump and the relay was £10.

All appeared to be ok, then 2 days later the light came on again. And let me remind you that there has never been any powerloss, or any symptoms at all from the car.

So back to the specialist and back on the diagnostics. This time it showed that the intercooler pump was at fault, so we did some research and decided to try the ford lightning intercooler pump. (from other posts i must say that typically the intercooler pump presents with power loss rather than a engine management fault). Any way car fine and again performing perfectly. 2 days and 20 miles later, the light is back on!!

I am going to go back to have the diagnostic check on monday - from I must say a very helpful merc specialist. It is also worth mentioning that all the wires were checked and there appeared to be no short circuits.

I would really appreciate any thoughts though at this point as to what could be wrong???

Al
 
in the early ownership of my CLK the engine management light lit on rare occasions, going off itself after a day or two.
A check at the dealers suggested a relay in the ECU was hanging fractionally by milliseconds at switch on or switch off, creating a spurious fault signal. The dealer offered a new ECU unit under warranty, cost more than a grand but I declined as it meant dash coming out --- and what faults after that!?
Anyway, I haven't seen the light for a couple of years now so I'm glad I left it alone.
Sorry, that's not much use to you if your light is not extinguishing but I thought the reason for my fault might be useful to you.
 
Last edited:
in the early ownership of my CLK the engine management light lit on rare occasions, going off itself after a day or two.
A check at the dealers suggested a relay in the ECU was hanging fractionally by milliseconds at switch on or switch off, creating a spurious fault signal. The dealer offered a new ECU unit under warranty, cost more than a grand but I declined as it meant dash coming out --- and what faults after that!?
Anyway, I haven't seen the light for a couple of years now so I'm glad I left it alone.
Sorry, that's not much use to you if your light is not extinguishing but I thought the reason for my fault might be useful to you.


Thankyour for that - i think having spent £560 - for something that didn't cause any symptoms -I too will leave this alone - after letting the specialist check it on monday

Al
 
Thankyour for that - i think having spent £560 - for something that didn't cause any symptoms -I too will leave this alone - after letting the specialist check it on monday

Al

Get the fault code from the dealer and then spend £60 or so on a code reader/re-setter (search for obd II code reader on ebay). My Maserati had exactly the same issue (secondary air pump- used to warm the cats) and the dealer checked it out and said to leave it alone as it all worked. I just then reset the light everytime it came on (300 miles or so) having checked that the code was the same.

Saved me a fortune and lots of wasted time going to the dealer to get it checked out each time.

All modern cars have an OBD II system which will tell you the fault codes.

CJ
 
Now there is a coolant leaking!!!

There is coolant leaking out from somewhere - hopefully something simple like a loose hose. Does the intercooler pump use the same coolant and as rest of the engine - ie radiator?

Al
 
coolant leak

There is coolant leaking out from somewhere - hopefully something simple like a loose hose. Does the intercooler pump use the same coolant and as rest of the engine - ie radiator?

Al
did you sort problem out only i seem to have same or similar problem 1st yellow engine light 4 weeks later intercooler appears to be leaking maybe just pipes fingers crossed what was the outcome for you
 

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