Ok, i have used the search forums...ive read alot but still not minimizing this...my car is throwing both these codes bank 1 and bank 2 running lean...car smells like rotten eggs once its been warmed up and up to about 85 mph or higher, before that speed i get no smell....im not noticing any loss off power except from the hole in the back of my muffler....(which is being replaced soon) i cleaned my MAF and it hasnt changed anything...this is a cali-spec maxima...so would this be my o2's my cat or what? lemme know thanks

 

You might need to post the actual codes (not "bank 1 and bank 2 running lean").

 

will do....

 

The codes are PO171 and PO174....running to lean on banks 1 and 2 :|

 

From what I've read, those codes together, in the end, usually point to a faulty MAF. I know you said you cleaned it but if it is faulty, cleaning it wouldn't fix it.

 

Rotten eggs usually mean converter

 

YEAH i was figurin the converter as well.....the question would be though, which one? my car has two pre cats and one main cat...?

 

Good question

 

Another one with no clear answer.....
i been on this subject for about 2 months with no clear indication, i get same issues, I replaced all O2 sensors, i havent gotten it in awhile but i do get nasty rotten sulphur smell when i pull hills, my next step is the MAF , but the car is running and driving fine.

 

Well that eliminates my o2's....imma try my MAF for now LOL

 

Same thing happened to my car.It turned out to be the MAF.

 

That SUCKS...good thing i can get my hands on a new one for 80 bucks LOL

 

i once had the same code (PO171 bank 1 system too lean) and turned out to be the MAF sensor. I had it replaced but it was semi costly for a new one + labor ($350.00). I had it replaced on the the LAST day of a 60 day warrenty lucky me.

no problems since then...

 

ITS FUNNY...SINCE I POSTED THIS....My check engine light randomly went out....any ideas?

 

If the codes don't re-occur, the light will go off after a certain period. I wouldn't be surprised if it goes back on though.
I'm having the same problem, I will try replacing the MAF if I can find a cheap one.
Anyone else got any more insight on this?

 

Mine been out over a month now, now that we mention it, it will come back on.

 

Does anyone know whats associated with the code p0430, whats needed to be replaced

 

http://www.obd-codes.com/p0430

 

i would replace the MAF first. If you need to replace the converter, replace the y-pipe while your at it.

 

Mine has to be the cat, dont know which one but i smell mean rotten eggs when i pull hills.

 

Yep, if it smells, replace the cat and the y-pipe.

 

I should be getting a new MAF tomorrow and get it reprogrammed, I will report back on how the car reacts to it.
My car also gets the rotten egg smell after hard pulls, which made me think the cat is bad, and it failed emissions testing (CO, which points to running rich or a bad cat). I will see how it does with the new MAF

 

i get the rotton egg smell around the same time frame...80mph+, i DONT GET IT AT ANY OTHER TIME...

mine is the precat...im pulling a p0430, i just havent gotten around to fixing it yet