c32used

I have a friend with a 04 C230k and following error codes


1. p0238
2. p0620
3. p0172



Recently the o2 sensor and alternator was replaced...car has over 130k miles. Front brakes were done but it still say brakes shop warning could it be brake sensors...I doubt they were replaced.

LILBENZ230

Yes you must replace the brake sensors in the pads to get rid of that warning.

Glyn M Ruck

New sensors & cancel all codes.

c32used

Which ones? They already replaced the o2 so what else?

Glyn M Ruck

P0172 = System too Rich (Bank 1)
P0238 = Supercharger Boost Sensor A Circuit High
P0620 = Generator Control Circuit Malfunction

OK - your friend has done O2 sensors
Have they diagnosed the SC boost sensor?
You say the regulator has been replaced in the alternator

And you are still triggering brake pad sensor warnings - replace the sensors - it should have been done with the pads.

Cancel all codes with a STAR or OBDII scanner & hopefully none will return