Wierd OBD 2 CODES

[Q_SHIP]

My car started to run like crap on the way to work. SES light came on. I read the codes and this is what I came up with.P0158-O2 bank 2 sensor 2P0302-Cyl 2 Misfire

And this is the one that stumps me.

U2500 (CAN) Lack of Acknowledgement From Engine Management

Any ideas what this is? 99 Q45T. KS and harness already have been replaced.

[elwesso]

Maybe an injector is going out?

[Q_SHIP]

The really wierd thing is it has all of the same synptoms of my KS's just minus the KS code.

[99q45t_vl]

Reset the codes. Replace the ignition coil, does it make a difference? Check the plug #2. Is it showing the rich mix? Gas smell? If yes then it's the injector. Ohm the injectors. Get the stetoscope and listen to the injectors clicking. Also, have the dealer run the power balance test.

[FarFetched]

Check EGR, downstream O2 sensor (after cat), check spark plugs, coils (resistance).

[FarFetched]

continue

[FarFetched]

Regarding CAN system in your car, it is too early for it to be in 99 model car!Don't worry about it!

[Q_SHIP]

Regarding CAN system in your car, it is too early for it to be in 99 model car!Don't worry about it!

Thanks for the help.

Why woult this code come up if it's to old of a car?