Newbie Q - shotcks and milage

Hi all -

I have a '97 XJ Sport, and I have two newbie questions:

1. I have about 134k mi. and I think the shocks are original ... I don't see any bounce over bumps but do see quite a bit of dive on a hard stop. I'm not sure what is "normal", so would this indicate that I need to replace the shocks?

2. I recently gave a buddy a jump, and a day later, the CEL came no. Codes didn't make sense ... 12 and 45. Well, 12 made sense as I disconnected the battery to see if the codes would reoccur. But 45 doesn't show up in the code lists I found (FSM from http://www.greatlakesxj.com/tech.html and CEL list from http://www.go.jeep-xj.info/HowtoECUcodes.htm) ... o2 or tranny ...

Here's the weird part. I noticed that the average fuel milage from the computer went UP from about 16.5 to 18.2 ... that seemed to point to the o2 sensor, but NOW the light has gone out, and mpg is still up around 18.

Maybe I should just forget it and be happy!

Any help or logical explanations are appreciated!

Cheers -- Greg

TTT ... anyone?

Cheers -- Greg

First, your year fully supports OBD II so take it to an autoparts store and have them pull any codes with a scanner. You can buy cheap ones for about $50.

If you look at the V6 codes (I know you have an I6), 45 does point to the O2 sensor. Check the connector and the wire harness.

As for the shocks, If they have over 50-60k miles, I would go ahead and replace them. You will notice a huge difference after they are installed.