Hey guys. I had posted a few months ago about restricted performance light.
The first repairman stated it was a throttle body issue due do detailers. I took the Jag to a friend of mine that works on imports, we cleared the codes (not a Jaguar OBD but recognized) which were a P0333 which indicated a knock sensor on Bank 2. After clearing and running the OBD a total of 3 times it always showed P0333. Of course being Supercharged requires a lot of work to get to the sensors. He poured a high grade injector cleaner and Octane boost to the fuel, only available to repairmen. I have ran 1/3 of a tank thru. The R/P light came on right after I left his shop and continued for about 50 miles and a few starts and now the light or R/P light has not come on. He suggested Ethanol free fuel to run for a couple of weeks and see what happens. Any suggestions? Can fuel cause a knock sensor to respond this way? I always run 91 octane. BTW, 67000 miles on this car and well maintained.

 

91 Octane is too low! 95 minimum.

 

Wow, thanks. I'll try it

 

That code will only show if your left side knock sensor is malfunctioning.

The code is telling you the sensor is not working correctly, not that its sensing engine knock. (which it may be)

You probably have a bad knock sensor and no amount of fuel additives are going to fix it.

My left one went bad at 69K miles.

Try plugging a new sensor into the wiring plug and see if the code comes back, if not, you have a bad sensor. You can then choose whether you want to remove the supercharger to get to the bad sensor to replace or choose to "relocate" the new sensor somewhere else that is accessable.

I got my sensors here for $28: http://www.ebay.com/itm/150991576244...84.m1423.l2649

See my posts here: https://www.jaguarforums.com/forum/x...s-codes-91090/
and here:https://www.jaguarforums.com/forum/x...sensors-90978/

There is some controversy regarding this, but I "relocated" my left side sensor (I did not want to remove the supercharger!) So far no problems. I always run 93 octane so I am not too concerned about it.
Vector

 

Sounds like a sensor issue to me.
Running high octane fuel is a good idea first the min being 98 octane

Failing that the is an off chance you have an issue in the opposing bank
A knock is actually detonation. IE fuel self igniting which is due to too much compression causing a high charge temp and igniting the fuel.

Is possible that the opposing bank has low compression and the adaptions have compensated for this causing detonation in the other bank but this is a long shot
Check the compression on all cylinders

Check the adaptions in SDD but id swap the sensors out first

Cheers
34by151

 

Just to clarify my earlier post and keep this diagnosis on track:
Code P0333 does not indicate knocking in the engine, it indicates a faulty knock sensor circuit.

P0333 - Knock sensor circuit high output.

Possible causes of OBD code P0333:

- Knock sensor circuit short to GND. - Knock sensor circuit short to PWR. - Knock sensor circuit open. - Damaged knock sensor. - Powertrain Control Module (PCM The Error code is generally activated on detection of the following conditions: - An excessively high voltage from the sensor is sent to Powertrain Control Module (PCM) or Electronic Control Module (ECM)

Fuel octane and cylinder compression have nothing to do with P0333, unless they caused the destruction of the sensor or the sensor circuit.
Vector

 

Thanks, that makes good sense. Can you reach the wire that goes to the knock sensor without removing the supercharge? and where is the best relocation?

 

Yes, the wire is the two conductor wire circled with the red arrow pointing to it in this pic. There are two connectors in that location, it is the one to the front IIRC.

I relocated mine in the valley between the SC and the intercooler on the same side, about 6" to the rear of the electrical connector in the pic.
Vector

 

Vector, Thank you for the knowledge. Very much appreciated.

 

The "thanks" button is on the lower right of each post, lol!

Glad I could help!
Vectopr

 

Vector, again thank you. I'm a little slow on this project but when you relocated the sensor, is their a plug that the relocated sensor will fit in or does it require a modify?. The picture helps a lot but not clear on the relocate.

 

If you are asking about an electrical plug, yes, there is one, you just plug it in where the old sensor was attached. See the arrow in the pic.

If you are asking about a lug or mounting surface on the supercharger, no, you will have to wing it there. I used epoxy and zip ties to hold it in place until the epoxy set.
Vector