# Jaguar XJS check engine light keeps coming on

**URL:** <https://community.cartalk.com/t/jaguar-xjs-check-engine-light-keeps-coming-on/126329>\
**Category:** Maintenance/Repairs\
**Tags:** jaguar, xjs\
**Created:** [October 7, 2018, 4:01pm UTC](https://community.cartalk.com/t/jaguar-xjs-check-engine-light-keeps-coming-on/126329 "2018-10-07T16:01:23Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![RichardEakle](https://avatars.discourse-cdn.com/v4/letter/r/46a35a/32.png) [@RichardEakle](https://community.cartalk.com/u/RichardEakle)\
**Post date:** [October 7, 2018, 4:01pm UTC](https://community.cartalk.com/t/jaguar-xjs-check-engine-light-keeps-coming-on/126329/1 "2018-10-07T16:01:24Z")

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I own a 1994 Jaguar XJS Convertible with 121k miles and in beautiful condition. My problem is a periodic “check engine light” message that shows up on my digital display window. I have replaced the oxygen sensors. My radiator temperature is not a problem. I am tired of uncoupling the battery cable to reboot the system. I am wondering whether one of the wires via the ECU overheats and causes the problem. I have been dealing withis issue for several years and no one seems to have an answer. Any ideas?

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**Author:** ![pyrolord314](https://avatars.discourse-cdn.com/v4/letter/p/6a8cbe/32.png) [@pyrolord314](https://community.cartalk.com/u/pyrolord314)\
**Post date:** [October 7, 2018, 4:04pm UTC](https://community.cartalk.com/t/jaguar-xjs-check-engine-light-keeps-coming-on/126329/2 "2018-10-07T16:04:25Z")

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> [@RichardEakle](#):
>
> My problem is a periodic “check engine light” message that shows up on my digital display window.

Have you pulled the code?

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**Author:** ![RichardEakle](https://avatars.discourse-cdn.com/v4/letter/r/46a35a/32.png) [@RichardEakle](https://community.cartalk.com/u/RichardEakle)\
**Post date:** [October 7, 2018, 7:11pm UTC](https://community.cartalk.com/t/jaguar-xjs-check-engine-light-keeps-coming-on/126329/3 "2018-10-07T19:11:22Z")

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I have tried to find out from other Jag owners to no avail. When the light comes on now it doesn’t signal any code such as 44 (which included oxygen sensors).