Hey all. Recently purchased a 2006 Porsche Cayenne 3.2L in Germany and already have a CEL. The OBD2 shows a Bank 1 O2 sensor fault. I'm having a difficult time nailing down which O2 sensor is the correct one to purchase. I see 4 total sensors on the passenger side of the engine. I looked at the illustrated parts breakdown for the vehicle and it identifies 2 different sensors in front of the cat and 2 identical sensors after the cat. Different sites show different applicable sensors. Anyone have any experience with this and know which sensor I should order? Thanks for your time.

 

They have color coded connectors with different tabs, so You cannot mix them up when installing. If You get an error code for one sensor and there is nothing on the service history about them, just get both sensors. They get slow when old and the other one will not be far behing. Just get original bosch sensors and you are good for the next 15 years.

For the sensors themselves, bank 1 is three first cylinders looking from the front of the car (when longitudinally installed), bank 2 is the rear three cylinders. Sensor 1 is always the primary sensor closest to the engine and sensor 2 is after the cats.

 

You know where to get the Bosch ones? I'm on Rockauto and they have Bosch for all positions except upstream bank 1. Will Delphi throw a code?

 

Sorry, I'm over on the other side of the world. I don't know about delphi specifically but after 20 years of wrenching with VAG engines, I've learned to use only OEM sensors and ignition parts as they are the only ones that will work 100% every time. Some no-name offbrand o2 sensor or maf sensor might work for 6 months (only good for those as cheap as possible repairs before putting it for sale) but swapping O2 sensors isn't fun enough to do again all the time. If it is a customer car, I won't even do it with anything but original parts.