check engine light

[Chas]

Thanks Malcolm, I bet you are right, an 11 year old car with 96k probably needs a new MAF anyway Why did it not show up as a fault on diagnostics ?

 

[Chas]

Airmass or a pair of leads to start the guessing off, you no we want fault codes Chas.......

The findings yesterday were" B37 POTENTIOMETER (THROTTLE PEDAL) stored fault, actuation and actual test within spec,
Cleared fault memory and tested, no fault " Car running ok, no problems........

Started car this morning, check engine light back on, same symptons as before

Update

I disconnected the battery for an hour, reconnected, started her up and engine check light not showing, but still reduced throttle power. Switched ignition off, took key out, started her up again and running perfect

Must be one of those annoying electrical things ?
I still suspect the MAF.........

 

[television]

The maf seldom comes up on a STAR test, you have to read between the lines with what is faulty or plausible on the read out

 

[WG M-B]

The findings yesterday were" B37 POTENTIOMETER (THROTTLE PEDAL) stored fault, actuation and actual test within spec,
Cleared fault memory and tested, no fault " Car running ok, no problems........

Started car this morning, check engine light back on, same symptons as before

Update

I disconnected the battery for an hour, reconnected, started her up and engine check light not showing, but still reduced throttle power. Switched ignition off, took key out, started her up again and running perfect

Must be one of those annoying electrical things ?
I still suspect the MAF.........

So now you have the mil light back on the fault code should be read again. It could well be the potentiometer

 

[Chas]

Update

Disconnected battery again.......... removed and unplugged the throttle pedal, reconnected pedal, fired her up, took a 20 mile drive in sports mode ( semi auto) went like a dream no errors!
Maybe the sensor plug /socket had residue or something ? Could I have removed oxidation and restored the electrical current?

 

[WG M-B]

Quite possibly

 

[Chas]

Touch wood......... still running sweet today

 

[Miffy]

When my tps first started to fail i tried switch cleaner. Worked for first few trips then failed again

Sent from my GT-I9300 using Tapatalk 2

 

[Chas]

When my tps first started to fail i tried switch cleaner. Worked for first few trips then failed again

Sent from my GT-I9300 using Tapatalk 2

Did you pull the pedal plugs out and insert them a few times also ?

 

[Chas]

Update

My car is still ok, MB tech said they had another W220 with exactly the same problem as mine and asked if I would bring my car in to compare readouts. I duly oblidged, the other car is still showing PO120 code in STAR, mine oddly enough flashes up the same code for a second on STAR then shows no fault code !

Fingers crossed mine is still ok

 

[Chas]

Update, problem reoccurred ! New pedal being ordered. MB have sold 143 throttle pedals this year for S class models, I am told