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11-07-20, 11:46 AM | #1 | |
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Engine Check light
Out for a little drive this morning and this light came on probably 3 times while accelerating but went off when I eased off. Anyone got any ideas what to check? Sent from my iPhone using Tapatalk
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1988 MB quattro 2012 S4 Avant |
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13-07-20, 10:00 AM | #2 |
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An MB with less than 30K miles? Might be the lambda probe playing up!
Or engine knock sensor-how long has the fuel been in? was the most recent fill up low quality? Last edited by BackintheFold; 13-07-20 at 11:54 AM. |
13-07-20, 02:45 PM | #3 |
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13-07-20, 02:59 PM | #4 |
4 ring whore!
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You need to pull codes as the ecu will store it when that light flashes.
Fuse in the fuel pump relay to trigger the code sequence
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1991 90 quattro 20v sport 1991 90 quattro |
14-07-20, 06:53 AM | #5 |
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Thanks Mike, am I right in thinking the MB erasers the codes when you switch the ignition off or have I just imagined it?
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1988 MB quattro 2012 S4 Avant |
14-07-20, 07:43 AM | #6 | |
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Quote:
The MB, or at least my MB, does not have a lambda sensor so I can rule that one out, and I always run super unleaded, it was last filled up about 6 weeks ago.
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1988 MB quattro 2012 S4 Avant |
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14-07-20, 08:17 AM | #7 | |
4 ring whore!
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Quote:
Best idea is to take it for a run and recreate the fault again. Pull the codes when you return without switching off. Only time I had that when accelerating, it was the inlet air temp sender in the intercooler - wiring had come away
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1991 90 quattro 20v sport 1991 90 quattro Last edited by mikes2; 14-07-20 at 09:18 AM. Reason: spelling |
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14-07-20, 09:15 AM | #8 |
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Phil Payne mentions the o2 sensor-in that when it dies (at around 30,000 miles) tape over or remove the warning light. I did find that odd but had no reason to question it.
EDIT This is for North American models only. i can confirm that the codes are lost when you switch off. Last edited by BackintheFold; 14-07-20 at 11:41 AM. |
10-09-20, 06:48 AM | #9 |
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Update.
Finally managed to read the codes (remembered to do it before turning the engine off ), code 2142: engine knock sensor. New ones don't appear to be available so I replaced it with a Bosch 0 261 231 040 on advice from Pete Reeve. It is a bolt through one, fitting was as you would expect (PITA) due to it's cramped location. Only done a couple of short trips but no reoccurrance of the blinking light so hopefully all is well again.
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1988 MB quattro 2012 S4 Avant Last edited by Tun; 10-09-20 at 10:19 AM. |
10-09-20, 08:35 AM | #10 |
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Same solution ( ex P Reeve) 15 years ago as well!
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