Hi I had to replace front part of the exhaust plus cat as the flanges had rusted away, replaced both with non genuine parts and all seemed ok. After a couple of weeks I got engine warning light come on, not running any different though. I have read online that this is caused by non Honda parts, I cleared light by disconnecting the battery for a short time but a couple of weeks later now back on again so question is do I need to change front lambda sensor this will be also non Honda or should I just try and ignore the light? regards john.