And the downstreams sensors are the ones that monitor the cats, so if it is cat converter efficiency faults it could be those. I've seen weird things throw the cat efficiency faults, it came up in my mothers E39 when I fixed the secondary air system and it put more air in at cold starts... cleared it and it never came back.

__________________
"When you do things right, people won't be sure you've done anything at all" (Bender, futurama)

You make something idiotproof, they'll make a better idiot

You think professional is expensive, just wait until you pay for amateur.

Never let your sense of morals prevent you from doing what is right.

Examine what is said, not who speaks.

X5 pics

RIP 4.6is.....

2003 4.6is