clive 2003 S-Type

My 2003 S-Type 4.2 litre. As of Oct 31, 2020, have 64,000 miles. Purchased Sept 2, 2002

I had the same restricted performance problem with my 2003 S-Type. Took to dealer and twice I paid for cleaning injectors and other service. Did not help at all. Finally, my battery went completely dead and replaced it. Found out through some other mechanics that this is a fairly common issue when your battery is getting weak. Battery was replaced a year ago and have had no issues with restricted performance fault warning. Hope this may help.

I'm in Rotonda West, Florida. Hello to all! Clive

I also had a restricted performance warning light for over a year. I went to Jaguar dealer 3 separate times, spent over $450 and they could not find what was wrong with it. After reading some posts on this forum last year, checked my battery and it had low voltage. I bought a new battery and BINGO, never had another problem with the restricted performance warning light, since last February, when I installed the new battery.

My 2003 4.2 litre does the same and I'm the original owner and have never had any problems due to the sound in 16 years.

I also have had the same problem. It first developed after I had the Jaguar dealer clean the injectors at 50,000 miles. The fault codes that showed up were PO442 (evaporative emission system leak-cannister valve or plennum gasket leak. PO174 Bank 2 too lean and PO171 Bank 1 too lean I've had the above items checked 3 separate times in the last 2 years at the dealer and they have not been able to find any leaks in the above items. There has been no actual performance reduction in the car. The final decision from the dealer (right or wrong) was to let it be until there is enough to really evaluate what may be actual leaking, as it would be too expensive to "guess" as they put it until the strike the correct fix. Like yours my engine light now will not go off unless it's reset. Not a good answer, but wondering if you also had your injectors cleaned recently before the performance error showed up. P.S. did not have any other malfunctions such as A/C. Probably a problem completely separate from the restricted performance issue.