I’ve been having an issue with my 2000 XK8 FHC. I keep getting intermittent problem codes. They designate issues with the throttle body. I did a web search and found a video on YouTube about the exact problem I am having. The video shows how to fix it. It also gives a referral to Automotive Scientific Inc. an Ebay company that does rebuilds of the throttle body. I am going to send my throttle body out next week to have it rebuilt. The turn around time is supposed to be under a week. I will update on the results. I also advise watching the You Tube video (Spa Guy) JaguarXK8 Fail Safe P0121 Code, How I repaired it. The video has numerous ata boy comments and thanks.
Stephen we had same problem! Fail safe mode and drive car then have to pull of road let sit for a bit then go again intermittent! Probably tps might start with that but I found a car at kickball usa… Paid 100 bucks for used one but you need to buy mounting gasket cause it’s metal crush kind. Never had problem since been bout one year took bout your to replace! There pretty pricey 1500 dollars.
Used throttle body with all sensors.
The rebuild is going to be a little over $ 300.00 US with shipping from me to them. Shipping from them to me is included.
I am planning on doing a major maintenance upgrade this winter including all hoses. I discovered the heater hose under the intake when I pulled the TB. I am also a bit shocked at the cost of all the hoses. I am going to be doing new front springs, already did shocks. I am also going to check the tensioners and replace the thermostat housing, cross over pipe, water pump and anything else that is reachable while I have the intake off for the heater pipe. The car has a bit over 100,000 miles on it and is my daily driver in season so I want it tip top next year.
I had my X308 XJR throtlle body rebuilt by ASI and it worked well. Eliminated the fail-safe errors and the chopping of power which I thought was downright dangerous.
I preferred it to a used throttle body because who knows if the used throttle body is any better. I suspect more than one AJ-V8 powered jag has headed to the scrapyard because of the throttle body failing. Even if it works, who knows how much longer it will last. You get a warranty with the ASI unit, and they’ve been around for a while (they fixed mine 5 years ago, and they were already established even then.)