99 XJ8 I am getting codes P0172 and P0175 and it seems to me as though I am going through gas quicker than usual. Recent transmission replaced with one that has 15k replaced engine a few years ago has 60k on it now. I have also noticed that my speedometer is showing how fast I am traveling. But, where you can see trip info this is showing incorrect average speed. when clear I can be going freeway speed and it reads in the 15-23. No, this is not reading the mpg 
I am wondering what would be causing this and would that have anything to do with the codes? Also when at freeway speed and maintaining it is a little rough.
Appreciate your help, thank you.
I am wondering what would be causing this and would that have anything to do with the codes? Also when at freeway speed and maintaining it is a little rough.Appreciate your help, thank you.
Veteran Member
This should be in this forum:
Jaguar XJ8 & Jaguar XJR - Jaguar Forums - Jaguar Enthusiasts Forum
But, as to your question:
P0172 = System too rich (Bank 1)
P0175 = System too rich (Bank 2)
This seems to be a different issue than the tranny issue, but it sure would cause lower MPG.
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Jaguar XJ8 & Jaguar XJR - Jaguar Forums - Jaguar Enthusiasts Forum
But, as to your question:
P0172 = System too rich (Bank 1)
P0175 = System too rich (Bank 2)
This seems to be a different issue than the tranny issue, but it sure would cause lower MPG.
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