big*blue*cherokee*

I have a little bit of a prediciment. My old cat is dead and I bought a new Magnaflow Cat that was supposed to be a direct drop in replacement, but it doesn't have the O2 sensor built into the Cat like my '97's does. If I put the new one on without an O2 sensor my Check Engine light will always be on. This wouldn't be a big deal if my XJ was just my trail rig, but since it's my DD i want know if there is actually something wrong with my engine. Does anyone know where I could find the cheapest replacement that's the same as my stock one with the O2 sensor.


Any help is greatly appriciated.

TrueBlueXJ

You should be able to get an exact OEM-style replacement at any parts store. I replaced mine about a year ago with a replacement from Advance Auto Parts.

Aside from not knowing what's going in with your engine should the check engine light be on constantly, you'll also effect your gas mileage. OBD-II equipped vehicles typically run a richer mix of fuel while the computer's "throwing codes" to avoid running too lean and harming the engine. My 02 sensor threw a code a few weeks ago, and in the three days I drove before I deleted the codes from the computer, I got around 15 mpg as opposed to my usual 22.

Bouncy

If you take your jeep to an exhaust shop, they can make it fit. Welding a bung in for the O2 sensor and welding the cat to your pipe. Something you should consider anyways to prevent exhaust leaks.

dmeastin

Where can i find a place that sells california legal pre cats? I have a 2000 cherokee with two pre cats and i need to replace them since I am putting on a header and exhaust and most of the bolts and flanges are all rusted together...