- Oxygen sensor failure: fixes the problem 95% of the time
- Oxygen sensor circuit failure (either the connector or the cable going to the computer): Fixes the problem 1% of the time
- Computer failure: fixes the problem 4% of the time
The computer is constantly comparing the upstream Oxygen sensors with the downstream oxygen sensors so it is always recommended to change them in pairs (front and rear for each bank). All you have to do to fix your code is to replace both oxygen sensors respective to your bank. For a guide on which parts to buy look below:
Question: What oxygen sensors do I need?
Answer: Depends on what car... Buy one of each, here is a guide:
1997 - 1998 XJ8 with a 3.2L and a 4.0L engine
- Denso 234-9016
for the front
- Denso 234-4798
for the rear
2003 - 2005 XJ with a 4.2L engine
- Denso 234-9030
for the front
- Denso 234-4798
for the rear
2006 - 2009 XJ with a 4.2L engine
- Denso 234-9125
for the front
- Bosch 15373
for the rear
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