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Car has set code po121 and went into limp mode. I restarted…

Hi Pearl, car has...

Hi Pearl, car has set code po121 and went into limp mode. I restarted car after 1 hour and limp mode warning has disappeared. everything appears to bev normal.

Mechanic's Assistant: Just to clarify, what's the exact code? And have you tried to reset it?

P0121 no not yet.

Mechanic's Assistant: What is the model/year of your Jaguar?

04 xjr x350

Mechanic's Assistant: Are you fixing your XJR yourself? What have you tried so far?

Yes there is nothing to try I am attempting to determine the most likely cause. indications are that it is the throttle body/tps

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

No thanks a lot

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Answered in 45 minutes by:
4/30/2017
Jaguar Mechanic: Dan, Technician replied 5 years ago
Dan
Dan, Technician
Category: Jaguar
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Jaguar Mechanic: Dan, Technician replied 5 years ago

This code is related to the throttle position sensor which is built into the throttle body assembly. I would recommend getting some throttle body cleaner and start by cleaning out throttle bore and throttle plate then also inspect connector condition. If problem comes back then the throttle body assembly will need to be replaced which is about a $600 job at a shop depending on where you go. Let me know if you have more questions or if there is anything else I can do to help. Thanks.

Dan
Dan, Technician
Category: Jaguar
Satisfied Customers: 27,580
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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