After living with a check engine light for a year on my 1999 Jaguar XJR due to a bad O2 sensor, I finally broke down and bought 2 new sensors (front, before cats). Drove the car into the shop, put it up on the lift and changed the sensors. Plug and play, right? Not so fast, apparently. The car started one time and then would not start again. The OBD is throwing the following codes:

P0447 - Evap Emission Control System Vent Circuit Open
P0444 - Evap Emission Control System Purge Valve Open
P1224 - Manufacturer Contrl Fuel Air Metering
P1000 - Manf Cntrl Fuel & Air Metering, Auxiliary Emission Controls

I tried clearing the codes, but no luck. The car cranks normally, but does not even try to start. Any ideas or help, please???

 

Have you knocked any under hood connections or not plugged something back in?

The P1224 is interesting possible causes include

Throttle adaptations not performed after battery disconnect - (try a hard reset but before starting the car pull the plugs and put a drop of engine oil down the bores, it might be a case of bore-wash. If it catches let the car do it's adaptations and idle for 10 minutes).

TPS disconnected (check the connections on the TB)

TPS to ECM open circuit/high resistance. (see above)

Throttle motor power relay failure...(again)
etc etc...

The others are related, if you snag the major issue the others disappear, sometimes

 

No, nothing is unplugged. The car started normally the first try, ran for about five minutes before I shut it off. I then tried to start it again, but nothing.....not even tries to start.

 

I've edited above - try another hard reset and let it run for 10 minutes not 5, the ECM didn't store the new fuel/air ratios and went into failsafe mode...

 

Disconnected the battery and left it off overnight. Reconnected it the next morning, but the car still won't start. The starter spins the engine fine, but it doesn't even begin to try to start.....nothing. Double checked to see if anything was unplugged; everything is OK. OBD still shows the same codes. What am I missing here?

 

move onto 'bore wash'...

 

Tried "bore wash" technique. No cigar. Could it be something with one of the computers?

 

Check for fuel pressure, you know pumps do fail and coincidences happen. That would be my first check after what youve done and described

 

Nope, its not the fuel pump. I'm stumped. Help?

 

What part number O2's did you use? What year XJR? I'm wondering if you may have the wrong or improperly wired O2's. Could have shorted to power or ground and popped a fuse or worse on start-up.