Throttle Body Plugs P0121 Code

Top view of Throttle Body

With air intake removed

Side view of plugs

Readjusted the plug connectors

Found that the plug stays were broken

Mirror view

On several occasions while driving the car I would get a Fail Safe warning and I would loose power. Thought that the TB needed cleaning. Did that and used BG 44k the problem cleared for a period of time. Then it did it again with the same codes. I removed the top plug and found that the clips were loose. Adjusted them to fit tighter and had no problems for a long time until a few days ago when I was on the toll road running about 70mph. and the car lost power. I moved the TB wires and I was on the road again. Today I took the time necessary and checked all the connections and found that the stay for the TB plug was broken allowing it to work itself loose. Alldata indicated that Jag had a service bulletin on the plug and suggested that the connectors should be replaced. I went to Jag and they only had the wire connectors. They did not have the plug that holds the wire connectors in place so I used a wire tie to hold it in place. 

This is part of the service bulletin  303-58

Engine Control - AJ27 MIL ON, P0121

303-58

DATE 11/02

V8 XJ Series/XK

MODEL
1999-2001 MY XK Range
1999-2001 MY V8 XJ Series

VIN
031303-A22860
853936-F40117

Check Engine MIL - DTC P0121 Flagged - Connector Material Mismatch - AJ27 Engines - Modify Harness

Issue:

On some 1999-2001 XK and XJ vehicles within the above VIN ranges, with AJ-27 engines, Diagnostic Trouble Code (DTC) P0121 (Throttle Position Signal) may be present. A possible cause is a mismatch of electrical connector terminal materials between the Throttle Position Sensor (TPS) and the wiring harness electrical connector (gold terminals on the TPS and tin terminals on the wiring harness).

Action:

For 1999 MY vehicles, also refer to Technical Bulletin 303-S498, Service Action S498.

On a customer complaint basis only, install new gold terminals into the TPS wiring harness electrical connector as follows:

 

 

Follow Gus_jagrepair on Twitter

You should follow JagRepair.com on Twitter

See us on Facebook

 

 

Please support JagRepair.com

 

 

Home | Contact Us!

JagRepair.com is designed as an information resource and is not a forum.

All information provided is believed to be correct and it is given in good faith. Users of this information will use good judgment and comply with all the safety rules that apply to operating tools and equipment. JagRepair.com cannot be held responsible if any of the information provided is not correct or does not work for you. Owner of the vehicle accepts responsibility with any and all applications they choose to use.

JAGUAR and its logo are the registered trademarks of Jaguar Land Rover Limited. Jaguar Land Rover Limited is not affiliated with JagRepair.com.

JagRepair.com © 2012 - 2017 by Gus Glikas. All rights reserved.
The JagRepair logos and all proprietary artwork, photos and content are the property of Gus Glikas and may not be reproduced or distributed without expressed written permission.