Hi,
We had a 52 plate corsa c with P0170 and found air leaks and the manifold cracked by the O2 sensor, so fitted new genuine CAT and a NGK/NTK O2 sensor and fixed other air leaks re set adaptations but a week later MIL back on same code so tried a new Bosch MAF, car ran sweeter but came back with EGR fault, so new EGR and gasket fitted, thought that would be the end of it but no it came back with P0170 no running issues, LTFT -1% STFT approx +5 to -5% O2 switching well, can anyone throw any light on this please.

Best regards
Charlie