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  #1  
Old 01-12-2010, 10:09 PM
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Pre-Cat Fuel Trim Lean AND Rich?!

I have a '06 3.0i. It was about 20 degrees F. The SES light came on and has been on for the last week. I ran it with an Actron Scanner...two codes showed up:

P1092 Pre-Catalyst Fuel Trim Too Lean Bank 2
and
P1093 Pre-Catalyst Fuel Trim Too Rich Bank 2

Why is it both? I have an appointment with the mech next week, but was wondering if it was okay to drive as it is now. Any help is appreciated. Thanks!

Last edited by binhly101; 01-12-2010 at 10:11 PM. Reason: More details
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  #2  
Old 03-04-2011, 06:15 PM
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Did you ever get this sorted? I've had P1092 before but never had both P1092 and P1093. Now I've got it. I've replaced the intake air boot which was cracked as well as popped in a new Siemens/VDO MAF. I drove around for a week and the SES light never went off. I cleared it with my scanner and it came back the following day. I'm lost.
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Old 03-06-2011, 08:31 PM
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I read a couple of posts on here and on Bimmerformums and I've decided to go the fuel system cleaner route a la dirty injector. I'm currently running 2-11oz cans of BG44K through. Hopefully this will clear it up.

Car runs great. Only thing I'd say is there's a very faint miss during idle but you would probably never notice it unless you're staring at the Tach with your ninja eye. Even gas mileage seems unaffected. On a recent road trip to Toronto and back, I averaged 21.3MPG with the family and some luggage and things in the back.
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Old 03-07-2011, 01:45 PM
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Oh sorry, I did not see that anyone repliedto the post. Um...it turns ot the gas I was putting into the X was the wrong kind.

Now before people start assuming that I was putting in normal unleaded...I was not. Actually I thought the station was top tier when it was not. I switched stations and voila, no more SES forever...
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Old 03-07-2011, 02:41 PM
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It's OK - I didn't expect you to reply since the thread was a year old! But thank you anyway. It seems that when the P1092 and P1093 appear together, it's somehow fuel-related. I'm hoping by the end of this fuel system treatment that my issues will be resolved. We shall see.
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Old 03-21-2011, 11:17 AM
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I've since swapped both Bank 1 & 2 pre-cat Oxygen sensors and hoping to see if the light comes back on in the other bank. That would make it easy and i'd just replace the stupid o2 sensor, even though it's only a year and a half old.
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Old 03-25-2011, 01:57 PM
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Light came back on. HELP!

I've swapped the O2s and the same P1092 & P0193 codes came back on. So it's something on Bank 2. Plugs?
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Old 04-21-2011, 11:20 PM
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Once again, the P codes have failed me. The P codes were wrong. After taking it to the indy last week, he hooked it up to the GT1, pulled the BMW codes which were 235, 236. This translates to Pre-Cat Bank1 & 2, too rich. After explaining that I've replaced the air intake boot that was cracked and the MAF, he said the only other thing he can think of, was the spark plugs. I have NGK Iridiums in there and he suggested going back to the OE plugs. So I told him to button it up and I'll come get it. It's been a week now, and I haven't replaced the plugs, but since he cleared it, the light hasn't come back on! So strange man....
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Old 01-04-2012, 10:00 PM
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That week turned into 2000 miles and the light came back on, with the same codes. Strangest problem I've ever dealt with. I've since replaced all coil packs, crank position sensor and switched to using BMW OE oil (thinking compression). My next items are cleaning the ICV (read about this on a few diff forums with relation to the P1093 code) and pulling the injectors and cleaning them.
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Old 01-05-2012, 12:31 PM
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How about you try the plugs as the indy suggested. You do know that not all NGK iridium will work in our cars? You actually have to cross ref the part numbers very thorough to make sure you get the right ones.
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