This has happened a couple times recently. I have a CEL but when I attach the scanner it doesn't establish contact and no codes read back.

Ideas?.

 

Try another scanner to see if the problem is with your scanner or with the car’s canbus/electrical system.

 

This may be a silly question, but in what position is the key? Mine only works in on position or with the car running.

 

car was running. not a silly question at all

 

Do you have aftermarket stereo or alarm system components installed? Those will often interfere with scan tools.

 

I have replaced the speakers only in the front doors. All else is original.

 

Were you able to resolve this? I recently purchased my first Jaguar an 02 VDP with 46,000 miles and also had this issue. It was a fuse in the passenger rear footwell fuse area. Sends power to the OBDII port. Check your owners manual for exact fuse number, I don’t recall off hand. Good luck!

 

Yes, a third scanner worked with the engine off. I had checked the fuses. I think there are two for the Jag Diagnostic System and one for the engine control unit. All fuses were fine.

Good luck to you.

L

 

Would you mind sharing which scanner worked (and which ones didn't)? Thanks...

 

i bought this cheap WiFi OBDII dongle and it works fine. Works for iOS with WiFi where most Android ones are Bluetooth. I purchased OBD Fusion for $10 and it works to diagnose and clear codes