CLC Class - W203 - M271.957 - 2008 - P0170, P0131, P0132 - EML On

[willdudeuk]

Hi can anyone help with the following fault codes on my CLC Class W203 please?

P0170
P0131
P0132

Not aware of any performance issues or anything obvious in the Engine bay.

Let me know if you’ve got any help or advice.

Thank you

 

[onefortheroad]

Your O2 sensor is likely
to be not working.

 

[willdudeuk]

Thank you @onefortheroad I shall remove the O2 Sensor and take a look to see if it is fouled up and also get the correct part number.

Could it be anything else or is it almost certainly the O2 sensor?

 

[onefortheroad]

Thank you @onefortheroad I shall remove the O2 Sensor and take a look to see if it is fouled up and also get the correct part number.

Could it be anything else or is it almost certainly the O2 sensor?

All codes point to the O2 sensor and fuel trimming.

 

[willdudeuk]

Thank you @onefortheroad just taken a look to get the part number.

Luckily it's in an easy place to access.

A 003 542 73 18

OS 0007 20t059

0 258 007 242

 

[willdudeuk]

Just need to source the right one now @DSK @onefortheroad

Am I better off going to the dealer for this sort of item?

 

[willdudeuk]

Looks like this is an old / obsolete BOSCH part number:


0 258 007 242 is superseded by

0 258 007 161 which is superseded by

0 258 007 290


from my research if anyone can confirm or agree would be great?


Used Bosch Classic to search the original OEM part number installed to the car and verified OEM part number was correct via VIN and a parts catalogue.

Vehicle and product search

A vehicle and product search will help you accessing spare parts and information for your classic vehicle.

www.bosch-classic.com

Then searched that superseded number (0 258 007 161) in google and say it has been replaced with 0 258 007 290.

 

[onefortheroad]

Use sites like autodoc , partsinmotion etc . Use your reg . You'll find cross references to the mb part numbers. The last one I bought was made by Bosch , once I cross referenced the part numbers.

 

[willdudeuk]

I’ve got the new lambda sensor but just trying to work out the connector end goes to.

Looks like it travels over the gearbox bellhousing.

Hopefully I’ll be able to see when I jack the car up but if anyone knows please get in touch. Thank you.

 

[onefortheroad]

I’ve got the new lambda sensor but just trying to work out the connector end goes to.

Looks like it travels over the gearbox bellhousing.

Hopefully I’ll be able to see when I jack the car up but if anyone knows please get in touch. Thank you.

Follow the cable , it's not rocket science.

Chop the plug off and use a newish ring spanner. Don't use anything that's worn that may round it off. Heat the engine first will also help with removing the old sensor.

 

[willdudeuk]

Managed to find it after removing one of the undertrays (the one behind the engine undertray).

The plugs / connectors seemed a bit wet with oil so cleaned them up with brake cleaner on the outside then used contact cleaner for the internals.

I used a proper lambda sensor socket that goes round the entire hex and it came out with ease (the old one) which I was surprised about as I’ve had issues getting them off in the past on other vehicles.

Then just zipped tied the new one onto the connector end of the old one and fed it through to save any faffing of routing it blindly.

Just need to reset the code and fingers crossed it’s fixed.

 

[willdudeuk]

**UPDATE** replacing the lambda sensor has resolved the issue. The light disappeared on its own accord after driving around for a while. Thanks for the help and advice!