If it's not really about tuning or wiring. Then it belongs in here.
Am i correct in saying O2 sensor reading is not used on wide open throttle on almost all cars ?
O2 Reading is used in cruise range and closed loop / partial throttle?
The reason I ask is a distant friend of mine has de catted his car which has 4 O2 sensor, 2 pre cat and 2 post cat. since removal no light but lots of errors in the info of the ecu.
I am thinking ecu will run the engine rich when reading is same on pre and post during idle / crusing and some people suggested lean. any thoughts on this please?
Hello it really depends on the car type make model etc but the can will go into a predefined fuel and ignition curve on most ecus to keep the engine safe
if the 02 sensors have been unplugged