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#1
11-28-2010, 09:44 AM
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The lean mixture faults are caused by unmetered air in the intake system, and has nothing to do with the evaporative system. The evap system is the fuel tank ventilation system, if that had a leak it would be different fault codes. One of the other ways to check for intake system leaks is to have a diagnostic tool that reads live data watching the upstream O2 sensor signal voltages and spray down all suspect areas with brake cleaner/carb cleaner etc and when you hit the leak the O2 sensor values stick pegged out at max rich. But the smoke tester is usually easier.
I'd figure out and fix the mixture faults, clear the codes. Then if the cat converter efficiency faults return again you might need to replace them. But I have seen those cat efficiency codes pop up every so often with mixture faults and never come back again.
__________________
"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 
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#4
12-20-2010, 10:58 AM
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3 mechanics couldn't find out whats wrong with it, and couldn't give me a definite answer that it could be the cat converter, so i called in a favor at the dealer, dropped off the car on Friday for them to check it out, i will update you guys within the next few days with what they tell me...
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#5
12-27-2010, 04:15 PM
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ok update... dealer said that i need a catalytic converter, and 2 O2 sensors... which i think they just went off what the diagnostic machine told them. which is exactly what my OBD-II machine told me. I still believe there is one thing wrong that's causing all these codes to trip. i have not went in to speak with them yet, i will post another update when i do. i do have one question though...
when my mechanic was replacing the O2 sensor on bank 2, the O2 was stripped, so he welded that hole shut and drilled another hole next to it and put the new O2 sensor. will drilling and putting the new O2 sensor in a different area cause a check engine light trigger? does it have to be put exactly where it was stripped from? Thanks alot guys, this problem is driving me nuts! the car is driving perfectly fine, and by the way, the dealer quoted me 3,000 to fix both O2's and the cat! haha crazy!
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