Check engine light
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Junior Member
Joined: Oct 2014
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From: Susanville, CA
Check engine light
What does the check engine light mean when it illuminates and how do I reset it? This is an 05 S Type w/4.2L V8.
Last edited by gpalmer4; Jan 14, 2017 at 02:32 PM.
Senior Member
Joined: Mar 2016
Posts: 630
Likes: 133
From: Near Berlin Germany
It means that there is a problem, if you get an elm 327 and use a program you will be able to read the code. That will tell you what is wrong.I use EOBD-Facile which can be used with windows or MAC. The full version also will let you reset the code.
How ever the first thing to do is check your battery because if the voltage is low you will get false codes. Change the battery over night and then turn the lights on 3 mins and then see if you have over 12.8
"So people have been replacing probably good batteries because they weren't being fully charged
In fact we've not been able to find any battery which is confirmed to not have calcium in it.
They and AGM batteries too, need 14.4 volts to fully charge.
OK... to test them for full charge, you can find what's called a "State of Charge" chart in many places on the web.
For a non-calcium (lead/antimony plates) battery, when it's fully charged it will show 12.65 volts after the "Surface Charge" is removed, or after resting for at least "several hours" - I take that to mean at least 6-8 hours, e.g. overnight. Measure before starting the engine, and directly on the battery terminals.
Calcium and AGM batteries will show 12.7+ volts when they are fully charged.
At the 13.6 volts which the 2002.5+ 2.5-litre and 3.0-litre S Types provide, they will only charge to 75-80%, 12.4 volts. " copied from Jim _S-V6_2004 ahttp://www.jaguarforum.com
How ever the first thing to do is check your battery because if the voltage is low you will get false codes. Change the battery over night and then turn the lights on 3 mins and then see if you have over 12.8
"So people have been replacing probably good batteries because they weren't being fully charged
In fact we've not been able to find any battery which is confirmed to not have calcium in it.
They and AGM batteries too, need 14.4 volts to fully charge.
OK... to test them for full charge, you can find what's called a "State of Charge" chart in many places on the web.
For a non-calcium (lead/antimony plates) battery, when it's fully charged it will show 12.65 volts after the "Surface Charge" is removed, or after resting for at least "several hours" - I take that to mean at least 6-8 hours, e.g. overnight. Measure before starting the engine, and directly on the battery terminals.
Calcium and AGM batteries will show 12.7+ volts when they are fully charged.
At the 13.6 volts which the 2002.5+ 2.5-litre and 3.0-litre S Types provide, they will only charge to 75-80%, 12.4 volts. " copied from Jim _S-V6_2004 ahttp://www.jaguarforum.com
Last edited by Ducmon; Jan 14, 2017 at 02:53 PM. Reason: added More information
Joined: Oct 2009
Posts: 11,057
Likes: 2,272
From: Perth Ontario Canada
In addition to the excellent advice from Ducmon, don't be surprised if there is more than one code. Write them down before erasing them (the actual code number, not the description) and don't be surprised if they return the next time you drive the car.
Write down the new codes but don't erase them just yet.
Let us know what you find.
Write down the new codes but don't erase them just yet.
Let us know what you find.