M-Class (W163) Produced 1998-2005: ML 230, ML 320, ML 350, ML 400 CDI, ML 430, ML 500, ML 270 CDI

2001 ML320 P0120

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Old 10-16-2016, 07:44 PM
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2001 ML320 P0120

I had for a while BAS ESP on and off with no problem with engine running normal. but couple of days ago car start running sluggish with no acceleration. I checked the code and it was P0120. I changed the Throttle position sensor by firewall and also MAF sensor with no change. I even do the rest steps several time with no success. Any suggestion will be appreciated. Thanks.
Old 11-22-2021, 02:23 PM
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I have this problem. resetting does not work. does Mercedes service center has to program the new TPS? please advise. Thanks.
Old 11-23-2021, 06:38 AM
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Why did you replace the EGR when you do not have a code for it?

There are two codes for P0120. One for the Throttle Valve and one for the Throttle Potentiometer.

You need a scanner to read the proper codes.

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Old 11-25-2021, 04:59 PM
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Thank you for replying to my question. i did not replace EGR. I replaced throttle Position Sensor. my question is does Benze service center to reporgram it. I already did the reset proceure but did not work. please advise. thanks.
Old 11-26-2021, 09:35 AM
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Sorry for the mistake.

Try the Adjust & Relearn PDFs.
Attached Files
File Type: pdf
Throttle Cable Adjust.pdf (107.7 KB, 108 views)
File Type: pdf
Throttle Relearn.pdf (11.2 KB, 64 views)
Old 11-27-2021, 11:33 PM
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thanks again for this important information. i'll keep it in my file definitely. I suspected the kickdown switch under gas pedals. removed it and test it. It failed. i pressed it multiple times, it passed the OHM meter test. I also removed the batteries connections for couple of days. Now it is working with no problem and I drove it for couple of blocks with no problem. I know it will fail again. i think it has rust inside. I will order the kickdown switch which is $28 from fcpeurop including tax and shipping cost.
Old 11-28-2021, 07:59 AM
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Hope it works for you.

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