Originally Posted by
CL770
Hi
The idle speeds sound ok, but I'm not sure that it's actually an idle control problem (as indicated by the code). Did you turn off the "rear oxygen sensor diagnosis" in the ECU when you fitted the new downpipes? It sounds like the ECU is going into closed loop mode when it reaches 190 and doesn't like what it's seeing. Just my guess, anyone else got any ideas?
It's a good guess, I did not turn off the rear sensors. The downpipes do have extended pipes to keep the rear sensors out of the exhaust stream. Maybe Rob from Needswing will see this and chime in.