S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

loosing power

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Old Nov 15, 2022 | 04:27 PM
  #1  
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S350L
loosing power

OK the situation is my car will RADOMLY ONLY at low speed loose power, putting your foot on the gas pedal does nothing its doesnt move, I found when I pulled into my driveway, put the car in reverse and went to go back the car would rev but NOT move, 2-3 times its been in slow traffic and its stalled also

Last edited by lee ashton; Nov 15, 2022 at 08:48 PM.
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Old Nov 16, 2022 | 01:34 PM
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S500
modern cars are so complex, you can't really hope to resolve without an understanding of the very comprehensive fault code information the car collects and sends down the OBD2 diagnostic socket - this sits in the footwell on the steering wheel side

generic ODB2 diagnostic apps or ebay scanners are NOT worth the 10 to 50 dollar cost and on a Merc or BM highly likely will be of NO help at all. The ODB2 std mandates 6 out of a possible 16 emission related data points can be found from this socket - but Mercs diagnostics sends more like 1000 diagnostic codes here for lots of systems in the car

for example each of the ignition coils fail often as does the crank position sensor - you haven't even indicated if its a tractor or a real petrol engine?

Last edited by BOTUS; Nov 17, 2022 at 11:54 AM.
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Old Nov 17, 2022 | 01:36 AM
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What BOTUS said, but in two words;

Pull codes
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Old Nov 18, 2022 | 05:03 AM
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S 350 Petrol
I had something similar (not exactly the same) and it turned out to be both rear wheel speed sensor reluctor rings on the outer CV joints. They had completely disintegrated. Replaced both and have had no trouble since.
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