# 2000 Jeep Cherokee

**URL:** <https://community.cartalk.com/t/2000-jeep-cherokee/2804>\
**Category:** Maintenance/Repairs\
**Created:** [August 8, 2007, 1:26pm UTC](https://community.cartalk.com/t/2000-jeep-cherokee/2804 "2007-08-08T13:26:36Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![robertmay1959](https://avatars.discourse-cdn.com/v4/letter/r/dc4da7/32.png) [@robertmay1959](https://community.cartalk.com/u/robertmay1959)\
**Post date:** [August 8, 2007, 1:26pm UTC](https://community.cartalk.com/t/2000-jeep-cherokee/2804/1 "2007-08-08T13:26:36Z")

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I have a 2000 Jeep Cherokee. I have about 130,000 miles on the jeep. I have taken it to 3 repair shops because my check engine light is on and the jeep will not start all the time. The last place I took it too said it was the starter and it needed a new battery. Now the repair guy is telling me I have to spend $2600.00 for the cataltic caverter to be replaced because it is not working? I believe the repair guy got the check engine light off. I told him not to replace the cataltic caverter. Can anyone help me out? THE COMPUTER PRINT OUT READS: P0420!!!HELP.

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**Author:** ![Cougar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cougar/32/21348_2.png) [@Cougar](https://community.cartalk.com/u/Cougar)\
**Post date:** [August 8, 2007, 3:41pm UTC](https://community.cartalk.com/t/2000-jeep-cherokee/2804/2 "2007-08-08T15:41:29Z")

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Here is a link you can go to and read about this error code. I would bet the converter is really ok but it could be damaged and need to be replaced. They have a extended warranty so it may be covered if it really needs to be replaced. By looking at the signal of the first O2 sensor a tech can determine if the CAT is really doing its’ job or not.

> **[P0420 Catalyst System Efficiency Below Threshold](https://www.obd-codes.com/p0420)**
>
> How to diagnose, repair, and info on symptoms and causes of a P0420 engine code which means the catalytic converter is no longer performing at a normal level.

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**Author:** ![robertmay1959](https://avatars.discourse-cdn.com/v4/letter/r/dc4da7/32.png) [@robertmay1959](https://community.cartalk.com/u/robertmay1959)\
**Post date:** [August 8, 2007, 6:10pm UTC](https://community.cartalk.com/t/2000-jeep-cherokee/2804/3 "2007-08-08T18:10:21Z")

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Thank you. We will look into this. It did not say anything about a 2000 Jeep Cherokee.