hi all

Ive just had a sports catted downpipe fitted to my v5 sti.

the idle speed is flicking between nearly stalling to around 1000rpms?

Anyone had similar/ diagnosis

Ive driven the car and it runs perfectly theres no hesitation although ive obviously not booted it as its needing mapped to suit the downpipe.

 

ive done the ecu check via the black connectors under the steering column - steady flash of engine check light and shows no faults

Anyone got any ideas

 

I would guess the lambda sensor is causing the issue due to being removed.

 

Are they fragile, the existing sensors fitted to the new down pipe