How does the K-Pro work with a race header that doesn have a secondary oxygen sensor?
The K-Pro uses the US-models’ primary (wideband) oxygen sensor to determine air-fuel ratio and for open/closed loop operation. The secondary sensor simply determines if the cat is there and the primary sensor is working. Without the secondary sensor, the ECU will cause a P0134 error code that can be disabled in the K-Pro Parameters window.
