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Stan
Stan, Mercedes Technician
Category: Mercedes
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Experience:  Technical support engineer
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Mercedes-Benz C220 Cdi Mercedes C220 Cdi 2005 (W203) In England ESP

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Mercedes C220 Cdi 2005 (W203) In England
ESP came on intermittently but now comes on every time after starting car. Local non-Mercedes garage produced the following codes:-
C1173 Steering angle sensor - N49 Plausibility Error
C1161 Rotation Speed and Lateral Accelerator Sensor - B24/15
C1036 Steering Column Module - N80 Control Unit
C1172 Steering Angle Sensor - N49 Internal Fault

Where to start? Surely not all of these sensors are faulty.

Thanks
David963

Diagnostics Engineer :

Hello David,
Please start with thorough battery test. If the voltage during cranking of engine with starter, falls below 10 volts, electronics will start registering the fault codes. It might progress to the point that transmission will go into emergency running mode after engine start.

Diagnostics Engineer :

Make sure that all fault codes are erased, so that it will be clear which ones are directly related to the issue.

Diagnostics Engineer :

Regards, Stan

Customer:

Hi Stan

Customer:

I have charged my battery for 24 hours but it has made no difference to the warning coming up "ESP Fault contact the workshop". I also turned the steering wheel 5 times left and right. Only the message comes up but the car drives fine. The orange warning does not light.

Diagnostics Engineer :

Please have the voltage drop checked during starter operation. If it falls below 10 volts- the battery might not have sufficient capacity and has to be replaced.

Diagnostics Engineer :

Another possibility to test the battery, is to see if warning message will come up while cranking engine with connected battery charger. If this stops error message from coming up- that would confirm battery fault

Customer:

Hi Stan

Customer:

Although I was sceptical about the problem being with the battery as it has started first time without any sign of a problem right through a severe winter. I am now noticing days when I get no error message and that these are usually mild days. I will therefore monitor the problem through Spring and Summer and if as likely your diagnosis is confirmed I will get a new battery fitted before next winter.

Customer:

(Sorry I keep pressing enter to change line) Again apologies for my scepticism but if you are proven correct you will have saved me hundreds of £s as I am sure that the local Mercedes garage would just have started changing sensors. Many thanks.

Customer:

I have pressed green accept but will appreciate your remarks on my points.

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