Hi, I have a Jaguar XJR 4.2 2004, sometimes when I'm driving shows a advise message " restricted performance " ,( the car really has loss the engine power) .


Asked by Oct 13, 2015 at 02:31 PM about the 2004 Jaguar XJR

Question type: Maintenance & Repair

Hi I have a Jaguar XJR 4.2   2004, sometimes when I'm driving  shows a
caution message " restricted performance " ,( the car really has  loss the
engine power)  I have to stop the car, cut off the engine and wait some
minutes start the engine again and go for more some kilometers until the fail

6 Answers


I assume your CEL is on also? If you don't have a code reader, it's just a pure guessing game. It's going into limp mode, the reason why? Ignition system, wiring, fuel system, computer failure, throttle body, maf sensor, etc etc

1 of 1 people found this helpful.
Best Answer Mark helpful

ok Mark, tks, I understood, I need to check the codes , it's possible to check without a code reader , or use a common one ? Where is located the connector to read ?

1 of 1 people found this helpful.

Any obd2 code reader should get you some codes. It's under the dash. No other way to get codes...it's not an old one with flashing lights to signify codes... Besides with the amount of codes we have these days, you'd be counting for 30 seconds :)


Hi Mark, take a look ... E P 1339 E P 1233 E P 1338 E P0057 H 02 S HEATER CONTROL CIRCUIT LOW P P0057 H 02 S HEATER CONTROL CIRCUIT LOW


what means the letter E in red before of code ( E P0057) and the letter P in grey before code ( P P0057 ) ? Because the last code was repeat,only changed the letter and color .

2 of 2 people found this helpful.

Low performance air cleaner dirty. Replace air cleaner.

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