BMW e53 P1092 and P1093

[Roberto G.]

Hi, I have a 2005 BMW X5 with 111K miles.
I got a P1092 error code that I fixed by cleaning the MAF.
Also as a precaution I also cleaned the ICV.
I put everything back together and the car runs fine.
Shortly after I got a P1092 and P1093.

I'm not sure how to go about fixing the cause of the issue.
I read about replacing the pre cat 02 sensors.
Car runs fine BTW.
Any suggestions and guidance will be greatly appreciated.
Thank you!
Roberto in Phoenix

[andrewwynn]

What are your fuel trims reporting and can you read your real time O2 values?

Also what scanner are you using?

Rich can also be dirty fuel injectors.

Can you reset your fuel adaptation with your scanner?

One more; fuel mpg?

[Roberto G.]

Hi, I’m not an expert however I tried my best to captured the data you requested.
Mpg is normal, about 15-17 mph.
I used a non bmw generic sensor.
Thank you very much.

[andrewwynn]

Originally Posted by Roberto G.

Hi, I’m not an expert however I tried my best to captured the data you requested.
Mpg is normal, about 15-17 mph.
I used a non bmw generic sensor.
Thank you very much.

The fuel trims are off scale but you have errors for both lean and rich.

This usually means MAF at fault.

Sadly they are not cheap I recently replaced mine and still had errors until finally one o2 crapped out and gave erratic output and stood out.

You need a better scanner becuae after replacing fuel control parts the adaptations need to be reset.

On the cheap you should also have an app for phone like OBD fusion so you can graph o2 readings. They bounce around too much to use just the values.

I use think diag and foxwell scanners though I'm still not recommending think yet the software is very kludgy though they recently updated and it runs without immediately crashing.

Until you can get some real time charts of O2 sensors you are driving blind.

There is a tip from the forum on the MAF: while the engine is idling, tap the. MAF with the handle of a screwdriver (like a tiny hammer). If the engine stumbles the MAF is shot.

[Corellian Corvette]

Or unplug the MAF and see if it runs better.

Cleaning the MAF, IMO, is a bit of a myth. As part of maintenance if you have a reason to think you've gotten something in there (or are using a K&N) then fine to clean periodically, but it's not going to bring back a bad one.

[Roberto G.]

Thank you guys for the guidance and advice.
So to recap:
-Replaced MAF sensor
-Cleaned secondary air flow sensor
-Cleaned idle valve, valve passed the flapping test
-I'm still getting P1092 and P1093
-The car is running fine at low and high speed, no noise, it runs smooth.
-I forgot to mention that sometimes I after I drive the car I sense a strong GAS smell outside the car.

Tonight I did additional troubleshooting as suggested in this forum:
-While the engine is running (idle) I tapped a couple of time the MAF sensor with the handle of a screwdriver. The engine kept running fine
-I unplugged the MAF and I got a FAIL SAFE error message (as expected). The engine runs fine regardless if the MAF is connected or not. I did this test several time, engine ran fine.

Next steps:
Unfortunately I do not have a BMW scanner, nor I'm an expert in BMW engines and troubleshooting.
Due to this I called my BMW mobile mechanic to take a look at the car.

If you think of anything else I can look at, clean, or replace please let me know.

Again, the engine runs fine other than the occasional gas smell (outside the car) after I ride the car for a long period of time.

I welcome any advice and words of wisdom.

Thanks so much,
Allan

[andrewwynn]

You should never smell gas so you need to track down that.

Start with getting an under load gas pressure and also confirm your FPR is functioning: set up a gas pressure tester and leave it on overnight. You should have pressure still maybe 20#.

Pressure fluctuation will cause both rich and lean. Also: run some injector cleaner. You said you replaced MAF; OEM? At least once in the past year, somebody had similar symptoms after replacing MAF. They put the original back in and the problems went away (because they also fixed the other things that were the real problem)

[EODguy]

Gas smell especially after filling (a day max) is the return bypass filter in the filler neck.

Sent from my SM-A730F using Tapatalk

[Roberto G.]

Hi guys!
Here is a summary of my current situation with the BMM e53:[LIST][*]Replaced my MAF sensor again, this time an OEM. 92 & 93 codes are gone[*]Fuel processing numbers started to look better [*]Now I'm getting a single error which is P0430 (CAT Syst efficiency below threshold bank 2)[*]Car is running smooth and fine, same as before[LIST]

My mechanic suggested to replace the 'Catalytic Converter (one) w/exhaust manifold & Integrated Catalytic Converter', which makes sense
The cost of this 'remove and replace' is like 1/3 of what I paid for the X5 in May.
I love my 2005 X5, however I cannot bring myself to justify a 2k plus fix.

I've read about a couple of short term inexpensive fixes I can do improve the performance of my X5. Ex. Catalyst cleaner.

Please help, any suggestions will be greatly appreciated. I truly do not want to get rid of my X5. S.O.S.
Thank you team!

[andrewwynn]

Do you have scanner that can plot a graph of your O2 outputs?

If not, get one. You can use a $20 WiFi obd adapter and $10 app like obd fusion.

On both of my 2001 X5 when the cats got tired I was able to reset the clock with some defoulers. It will take a tired cat and get it just over the threshold of acceptable but I need to see the graph of the sensor outputs to get a better idea.

The first ones were like $9@ but I couldn't find a good deal like that on the second set which were $30@ but far better design two piece 90° so not only 10x easier to install now it's 10x easier to get to the o2 sensors to change them as well (which I needed to as one failed with just over 2 years use)

The defouler only smooths out the signal so the cat can't be completely gone and still must function.

Crucially; if you are close to needing an emission pass, there is something you can do as well that is not snake oil like you reverse m referred to as found on the internet