Deep pockets implies lots of money. Have you ever heard the tale of the three blind men and the elephant. Each grabs a bit of information and creats a picture, each wrong.

You are approaching the problem like a blind man thus you will need deep pockets. Your question and problem is so general that it is hard to help you without trying to give you some perspective.

DO YOU UNDERSTAND the enabling criteria for the code that has been set?? An O2 sensor code is like saying my car is running bad. Everything causes O2 sensor codes!!! Any fault in control causes them. to analyze the problem one must first know the enabling criteria that was faulted. As I stated in the first reply O2 sensor get faulted for a number of reasons. The most common is that the sensor voltage stays at one voltage toooooo long. If the code says that, then the first test is to watch the O2 sensor voltage. It will be pegged rich or lean. You need to understand closed loop operation and verify it. If the problem is that it cycles too slow (the code will tell one this - there are more than one O2 sensor code in other words) then one should look at the heater circuit.

The codes give you a start, if the next step is the parts counter you will need deep pockets.

__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician