1999 XJR. Intermittent RP light, and hard check engine light.
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Joined: Oct 2017
Posts: 19
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From: Chicago, Illinois USA
1999 XJR. Intermittent RP light, and hard check engine light.
Hi Guys,
It seems that this is a common XJ affliction. The car runs fine, but the CE light stays on, and RP pops on, usually after the car is stopped and well heated up. It stays on for a minute or less, then pops off.
I've cleaned the MAF sensor, but am still getting P111 codes, as well asPO171, PO174 (lean, both banks). I've ordered a new breather hose as I noticed oil on the valve cover, and a bit on the intake downstream of the MAF.
Brand new air filter, and there are no obvious vacuum leaks.
What's next?
Thanks,
Max
It seems that this is a common XJ affliction. The car runs fine, but the CE light stays on, and RP pops on, usually after the car is stopped and well heated up. It stays on for a minute or less, then pops off.
I've cleaned the MAF sensor, but am still getting P111 codes, as well asPO171, PO174 (lean, both banks). I've ordered a new breather hose as I noticed oil on the valve cover, and a bit on the intake downstream of the MAF.
Brand new air filter, and there are no obvious vacuum leaks.
What's next?
Thanks,
Max
Joined: Dec 2011
Posts: 120,439
Likes: 17,005
From: Durham, UK
Welcome to the forum Max,
Good to have you with us at Jaguar forums.
The possible causes of P0171 and P0174 are:
1. Engine misfire
2. Air intake leak between MAFS and throttle
3. Fuel filter, system blockage
4. Fuel injector blockage
5. Fuel pressure regulator failure (low fuel pressure)
6. Low fuel pump output
7. HO2S harness wiring condition fault
8. Exhaust leak (before catalyst)
9. ECM receiving incorrect signal from one or more of ECTS, MAFS, IATS, TPS
P1111 is a status, not an error - all OnBoard Monitoring tests have been completed.
Follow this link XJ XJ8 / XJR ( X308 ) - Jaguar Forums - Jaguar Enthusiasts Forum to the X308 forum for help, advice and information. The 'HOW TO' thread at the top is a good place to start for information on regular issues.
Please remember to add vehicle details to your Signature to help others to give relevant advice. Go to the User CP button on the left of the top menu bar, then Settings & Options under Your Control Panel. Select Edit Signature and enter the details.
You can also visit the US Midwest Region forum by following this link https://www.jaguarforums.com/forum/us-midwest-39/ to find other members in your region.
Enjoy the forums.
Graham
Good to have you with us at Jaguar forums.
The possible causes of P0171 and P0174 are:
1. Engine misfire
2. Air intake leak between MAFS and throttle
3. Fuel filter, system blockage
4. Fuel injector blockage
5. Fuel pressure regulator failure (low fuel pressure)
6. Low fuel pump output
7. HO2S harness wiring condition fault
8. Exhaust leak (before catalyst)
9. ECM receiving incorrect signal from one or more of ECTS, MAFS, IATS, TPS
P1111 is a status, not an error - all OnBoard Monitoring tests have been completed.
Follow this link XJ XJ8 / XJR ( X308 ) - Jaguar Forums - Jaguar Enthusiasts Forum to the X308 forum for help, advice and information. The 'HOW TO' thread at the top is a good place to start for information on regular issues.
Please remember to add vehicle details to your Signature to help others to give relevant advice. Go to the User CP button on the left of the top menu bar, then Settings & Options under Your Control Panel. Select Edit Signature and enter the details.
You can also visit the US Midwest Region forum by following this link https://www.jaguarforums.com/forum/us-midwest-39/ to find other members in your region.
Enjoy the forums.
Graham
Joined: Apr 2012
Posts: 25,836
Likes: 4,702
From: Summerville, South Carolina
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Welcome to Jaguar Forums Max,
Good to have you with us.
Enjoy the forum.
If you haven't done so already you should add your car details to your signature to help others to help you.
If you need help with getting around and using the forum follow this link for some help Forum Help
Good to have you with us.
Enjoy the forum.
If you haven't done so already you should add your car details to your signature to help others to help you.
If you need help with getting around and using the forum follow this link for some help Forum Help
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