Hi everyone, I drive a 2004 Mini R50 w/ auto transmission (208,000 mi), and I started getting a check engine light with P2097 code in the summer. The first couple of times I was able to clear it, but now it comes back right away. I didn't notice any kind of performance loss or mpg drop, so I didn't think much of it. Now that it's fall and I am no longer running the AC, I started noticing RPM loss at idle. If it sits long enough, the engine light will blink and it'll throw a P0304 (cyl 4 misfire) code, but as soon as I start driving again it runs fine. Once I also got a P0313 code, but never since.

I replaced all spark plugs and wires, and swapped in a new coil pack. I replaced the air filter and ran Techron fuel system cleaner through the tank. I also reset the ECU and the BCU. But nothing has helped so far. Has anyone run across this before? If you can point me to an existing thread or share what else I should try, I would really appreciate it! Thanks in advance!

 

Did you ever find a fix to your issue? I have a similar issue with a cylinder 4 misfire only at idle (lean) but it runs fine when under load.

 

Swap injector with other cilinder, what happens?

 

I found that the pre-cat O2 sensor had chaffed wires, so I went ahead and replaced both O2 sensors. The car is running a little better, but I still have the P2097 light. Have not tried swapping the fuel injectors. I did listen to them with a screwdriver and they seem to be clicking evenly. Should I try swapping them anyway?

 

If the error swaps over to the other ciliinder, then you will know more. It's all about eliminating things one by one.