P0313 Po430 P1093 P2098 check engine light please help!

[Dr. X5]

I have a 2002 BMW X5 3.0 with 140,000 miles on it. The car drives just fine with no problems. I keep getting a check engine light that never goes away. I changed 1 O2 sensor, cleaned my MAF sensor, and did an Evap Smoke test and came up with nothing. i would really appreciate some help on this...

P0313 PO430 P1093 P2098- here are the codes

Thanks

[Weasel]

Sounds like you have a lean mixture fault, I'd check the intake system for leaks. If the intake boot to the throttle body/idle air valve isn't cracking apart it could be the crankcase vent valve. The smoke test works good for the intake system too if you don't see anything off hand.

[Dr. X5]

hey, thanks for the reply... my mechanic already did an evap smoke test and everything checked out. No leaks anywhere. he mentioned something about a possible catalytic converter being bad... but i don't want to spend that kind of money to fix it and it not solve the problem... any other ideas?

Thanks again!

[SilverFox06]

Originally Posted by Dr. X5

hey, thanks for the reply... my mechanic already did an evap smoke test and everything checked out. No leaks anywhere. he mentioned something about a possible catalytic converter being bad... but i don't want to spend that kind of money to fix it and it not solve the problem... any other ideas?

Thanks again!

I have this problem. What was the fix?

[SilverFox06]

Smoke test done - no vaccum leaks. Can't rid of CEL. Code P1093. Anyone?

[Dr. X5]

like i said in my previous post, check out all 02 sensors make sure their good, if your still getting the same codes its the catalytic converter....

what i did not mention in my previous posts was what the reason was that my catalytic converter failed... well here it is

a year before the cat went out, i had a buddy of mine do a tune up by replacing the spark plugs... one of the spark plugs was not tightened and it loosened up and started making a air leaking noise that came from the engine... i eventually had a mechanic diagnose and fix the problem, but by that time my cat needed to be replaced... i hope this helps, cuz this problem drove me nuts...

now remember i had all those codes together, i don't know if your just getting the P1093 code... good luck!

[SilverFox06]

Thanks so much for your reply. I am not getting a code for the cat converter, but for sure I have put in four 02 sensors so far trying to clear the code. I also changed the elbow intake, the disa and the MAF sensor because I was getting a bunch of codes: P1092, P1091, P1093, P0171. The Stealer says if all else fails, I need a cat converter, but I am getting no code for it and like you, don't want to fork out that kind of money and the CEL is still lit.....

[Weasel]

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.

[Dr. X5]

great! thanks again, im going to run this information by my mechanic tomorrow and i will post an update with what they come up with.

[lo7100]

Any update?