PAK9

I read some threads and bought the OBD-II reader.

My Check Engine Light (CEL) is ON.

I pulled three codes today.

P0150 O2 Sensor Circuit Malfunction (Bank 2 Sensor 1)
P0155 O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
P0156 O2 Sensor Circuit Malfunction (Bank 2 Sensor 2)

Does this mean both front and rear O2 DRIVER-SIDE sensors went bad?

I reset the codes and driving it around waiting for the system diagnostic to cycle to "READY" so I can test again.

Anyone had this problem before?

Is this something I can fix myself?

ProjectC55

When I first bought my C43 I was told to chg all of them at once,as it is common for these things to go bad if they were never chgd b4. It was one of the first things I did.

MarcusF

With an O2 sensor socket, and a breaker bar, and a cold exhaust it's a simple job. Don't forget the anti-seize.

PAK9

Awesome. Thanks guys.

PAK9

Finally the check engine light went back on.

P0150 O2 Sensor Circuit Malfunction (Bank 2 Sensor 1)
P0155 O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)

So this is the driver side front sensor?

C43AMG

+1..............

ohlord

bank 2 sensor 1,drivers side pre cat sensor.You doing the r/r?
www.autohausaz.com has them,free shipping.Slightly warm pipe makes them easier out.Be careful with the wires.

PAK9

Yes I'll be doing the r/r myself. It shouldn't be do difficult.