I have a 01 xj with 97k. I just replaced my fuel pump with a bosch pump and everything seemed fine. Started the Jeep up today and now I have a CEL light. This is not my DD so I don't get to play with it much.

I ran the self test with no codes. I cleaned the TPS sensor just because.

I have an appointment tue for a new exhaust. It's currently open headers (had to cut the front pipe when I replaced the RMS) and I am having a new exhaust put in.

Is it possible the CEL is from the open exhaust and lack of back pressure? Once I get the exhaust on I will have the scan tool put on it to test at AZ.

 

The lack of O2 sensors can set off the CEL.

 

2001 is OBD2 requires a scanner to retrieve/erase codes.

 

1. You cannot retrieve codes on a 2001 XJ with the odometer test. All it does is a self test of gauges, etc. You must use either a code reader or a scan tool for anything past mid-1997.

2. Cutting your exhaust absolutely will trigger a check engine light and code. Get that new exhaust, reset the codes and you will likely be fine.

 

Thanks. I didn't know that 01 wouldn't read codes. I'll need to buy a scan tool then. All 02 sensors are installed. Exhaust was cut at the front pipe. It will be new from front pipe back with new muffler and high flow cat.

I'll install and reset. Thanks for the help.

 

Wait...

Why did you cut the exhaust pipe?

 

?

 

Couldn't get the exhaust apart when I was dropping my oil pan and trying to get the headers off. So I cut the fwd pipe and not the header.

 

This was one of the best investments that I made. Using free tools on my phone (I use Torque personally), you can retrieve the code and simply google it for more info;


On newer cars with better sensors, you can get some real street data-logging done which is really cool too.

Or just go to Autozone and have it done for free, but I like to leave mine in the car so I have it whenever I need it.

 

Nice. Imma order one

 

Went to the exhaust shop and had no CEL on the way there or home. Not sure what is going on but I suspect something is about to fail.

 

Is your exhaust fixed? Then drive it and see what happens. If you get a code, address it at that time.

If you have a check engine light, retrieve the codes and post the EXACT codes (not a description) here for comment.

 

Yeah it's good. I need an alignment real bad so I am not going to drive it regularly until that happens. I have to call the shop tomorrow to see when they can fit me in.