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What Part is Left to Change?

Tiny
JIMBEAUX
  • MEMBER
  • JAGUAR XJS
Hi folks; thanks for the help you give.

I have a 1995 XJS - 4.0L AJ16 - 90,000 miles.

MY muffler guy says one of my cats is beginning to show early signs of blockage. I have changed the plugs, fuel filter, and had the throttle body and fuel system cleaned. I feel a random and inpersistant rough idle and my mileage is not what others get with this car. I get codes P0420 and P0430. Do I have a bad coil (there are 6 coils), a bad O2 sensor, a bad/dirty MAF, or bad injector? At running speeds, I notice no roughness or hesitation. Thanks for the advice. PS, any way to home test the items?
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Wednesday, May 16th, 2007 AT 9:09 PM

1 Reply

Tiny
FSTRANGER302
  • MECHANIC
  • 117 POSTS
Hello, the two codes you have are catalyst effeciency codes. The mean yes the catalyst are going bad and it is nessesary to replace.
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Friday, November 16th, 2007 AT 7:14 PM

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