Originally Posted by mcvespa

Hi everyone,

My check engine light came on once again. With the key in the on position (car off) I held down the button under the hood for 3-4 seconds. The light then flashed 4 times. I did it again to see if there were any other codes and it flashed 4 times once again. I then cleared the codes by holding the button down for more than 6 seconds.

Code 4 states: Air injection inoperative. So what now? What are the components that may be at fault here?

I should point out that the car runs fine and I recently replaced the air filter.

Thanks,
Michael
95 e320 Wagon / 100K