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E420T
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Discussion Starter · #1 ·
Hello fellow benz owners

I was recently given a 1997 E420T from a friend at work. He warned me that it has been idle for quite a while, i.e. not used for 6month+ in polar winter conditions (Sweden), and is due for inspection at the end of the month.

Loving my new benz, I decided to change a wheel barrel and the suspension springs, which were in poor condition. And then went to a (local, round the corner) mechanic to get the rid of the ESP/ASR warning that was flashing on the front board whenever I started the car (ASR light is lit and the display shows ESP in capital letters).

The mechanic ran the car through some generic diagnostics software called MekoDiagnostic, through the (i think) 38pin obd adapter. And was able to clear almost all the warnings that showed up (I'll address them later, need to get it through inspection first!). Removing the warnings did however not solve my problem, the ESP light still came on, and so did the ASR. Upon further inspection the mechanic noticed that two of the warnings were back, namely the ones related to the transmission with codes 8 and 104, which suggests "R/P lock solenoid valve defective.".

He (the mechanic) then proceeded to state that these warnings are the obvious reason for the ESP malfunction and suggested a friend of his that could fix it. I am however sceptical...

Bottom line, do you guys think its possible that a defective "R/P lock solenoid" can cause these ESP warnings or is it more likely that this is an unrelated problem, and that his generic software could not find the specific ESP related fault? My walled has had an rough month, don't think it could bare a visit to an authorized Mercedes mechanic...
 

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2001 E320 - Brilliant Silver/Ash: 107,000+
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17,201 Posts
That sounds fishy and I would get a 2nd opinion. I could be wrong but I don't think the ESP feature has anything to do with the transmission. The anti-skid properties are the result of selectively applying the brakes to individual wheels, not lowering or raising the gear you are in.
 

· Registered
1922 Ford T no OBD, no ECU, no SCN
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37,921 Posts
Good part about getting older car is that all common problems are well known and the fix procedure well establish.
So for transmission code - start with plug adapter replacement and good plug and computer bath.
For traction start with checking if all the wheels are the same size. Than check the gearing at the wheel sensors and sensor themselves.
Good scanner should pinpoint what wheel is giving you trouble, although European models did not have OBD technology in those years.
Welcome to the forum and I hope you get to really enjoy the ride.
 
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