o2 sensor question

[blytha]

Just a quick question.
I've replaced my post cat Lambda sensor with one of these, due to a P0160 code (bank 2 post cat issue), now the car is giving P0050 and P0154 errors (bank 2 pre cat issue).

I’m in a quandary now, as I have just gone on there to check for a Pre cat O2 sensor and noticed that the date for the part I fitted was 09/01 – 07/04 and was wondering whether the part I fitted was wrong? No errors on post cat sensor!
My car is a 2005 C4S with and M96.03 engine.

Also is it usual for one sensor to be replaced just for one that is not replaced to throw an error

Any help appreciated.

If the parts are interchangeable I'll get the pre cat sensor to go with it, otherwise I'll have to find the correct part.

regards,

Anthony

[Ahsai]

Do you have a 996 or 997? That part seems to be just for 996s. Also, do you have a scanner that displays real-time O2 sensor readings?

[JFP in PA]

Just a quick question.

I've replaced my post cat Lambda sensor with one of these, due to a P0160 code (bank 2 post cat issue), now the car is giving P0050 and P0154 errors (bank 2 pre cat issue).

I’m in a quandary now, as I have just gone on there to check for a Pre cat O2 sensor and noticed that the date for the part I fitted was 09/01 – 07/04 and was wondering whether the part I fitted was wrong? No errors on post cat sensor!

My car is a 2005 C4S with and M96.03 engine.

Also is it usual for one sensor to be replaced just for one that is not replaced to throw an error

Any help appreciated.

If the parts are interchangeable I'll get the pre cat sensor to go with it, otherwise I'll have to find the correct part.

regards,

Anthony

Before going any further, your original code (P0160) if for an electrical connection fault, not necessarily meaning the sensor itself was bad. Both the sensor and sensor heater wiring should be checked for the correct voltages (0.4-0.5V) and shorts (heater should read >20K Ohm). This could be a wiring issue as much as a sensor problem.

P0154 is for a similar issue on the other sensor. Before swapping any more parts, I'd start looking at the wire harness and connectors, and test the sensor and heater circuits for correct readings. Getting the same "connection fault" codes on both sensors is probably not a coincidence.

[Ahsai]

Also, you can check for the right BOSCH sensor on this site http://www.boschautoparts.com/VehiclePartFinder/Pages/VehiclePartFinder.aspx

[blytha]

Hi,

I've checked with the retailer and it's the correct sensor. I've also monitored the voltages on the sensor, (well a friend did :wrench: ) and the sensor is definitely failing. Looks as though I will need to get the pre cat sensor as well :cursing: .

Thanks for all the help

[binger]

Blytha,

Ahsai & JEP are correct with their advice. There is also two TSBs you should know about from Porsche. I don’t know where your friend took the reading from the DLC connector with a durametric, PST2, Piwis or by directly taping in to the sensor. If he just used the DLC connector he may have false readings because of a connecter issue at the sensor. See TSBs below.

1. Oxygen Sensor Connections

http://www.renntech.org/forums/files/getdownload/159-167carrera-oxygen-sensor-connectionspdf/

2. Oxygen Sensor Heater Faults: Update of the DME Fault Software (ME 7.2)

http://www.renntech.org/forums/files/getdownload/172-181carrera-oxygen-sensor-heater-faults-update-of-the-dme-fault-software-me-72-pdf/

Edited October 23, 2013 by binger