'93 W124, 3.2 liter M104 - CE light, found 2 codes
I got the dreaded check engine light again today.
1993 W124, 3.2 liter M104 engine, about 138,000 miles.
I checked the LED display and got a #4 code and a #26 code.
#4 seems to be Air Injection Inoperative.
#26 is upshift delay switch-over valve open or shorted.
I was plagued with the #26 code until I changed the valve and cleaned out the vacuum line. I can't believe the valve could already have gone bad or the line could've plugged up again. The part can't be 6 months old.
Is #4 as obvious as it seems? Does it mean that the Air injection pump that runs for 45 seconds on cold start-up has broken?
Thanks in advance.
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