Most likely (in this order):
- Bad upstream oxygen sensor: Denso 234-9029
- Bad downstream oxygen sensor: Denso 234-4798
- Bad catalytic converter
- Bad wire between the computer and the sensors
- Bad computer
So what do you do? If you haven't replaced the oxygen sensors already I would do that first, because they do go bad and new sensors show small improvements in fuel economy. I would change them first try the upstream (because is closer to the engine and works harder), then the downstream.If that doesn't work you might want to try and exhaust shop because the Jaguar original cat is really expensive.
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ReplyDeleteThanks for this information. I had a P0430 error and replaced both sensors...after a week, the error has yet to return. Prior to replacing the sensors, I ran a gallon of lacquer thinner through 10 gallons a fuel, but that didn't clear the code, so I went with the sensor replacement. Replacing the sensors is pretty easy. The bottom sensor is (I think) a 22mm wrench - but the upper sensor needs a special wrench, or else you will never be able to access for removal. Thanks for this info, I hope my input helps the next guy. - JD
ReplyDeletedo you have a link for the wrench?
Deletewould switching them do any diagnostic advantage?
ReplyDelete