Ok, I did a 200 mile trip today. About 40 miles in, limp mode. Pulled over, cycled key off and on again...reset. About 15 miles later...limp mode.

Lather, rinse, repeat.

After the third time, CEL came on. The code reads P2237, which is O2 sensor, bank one, sensor one.

Ironically, the car ran better with CEL lit...no smoke, no early upshifting, and I had turbo. So I didn't reset the code for the rest of the trip.

Tonight I will swap EGRs with my other CDI, and see if the issue follows the car or the EGR valve. I have another 150 mile trip tomorrow night.

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Mark in MA
05 MB E320CDI 402k Granite Grey Metallic
05 MB E320CDI 267k Black
05 MB E320CDI 232k White
05 MB E320CDI 209k Tectite Grey
99 Dodge 2500 Cummins 5sp 148k
62 Jeep CJ-6 120k