Simultaneous P1093 P1092 Codes!
 

Hi Everyone,
2004 X5 3i
I'm getting these 2 codes that are really contradictory to me. How can it be possible for a situation to trigger these codes at the same time.
I've cleared the codes and run the car 3 times to see if they repeat, and they did.
P1092 Pre catalyst fuel trim system too rich bank 2
P1093 Pre catalyst fuel trim system too lean bank 2
And here is the freeze frame if interested. It always happen at the colder coolant temperature about 5 minutes after a cold start.
Any insight will be much appreciated.
Thanks,




DTC that caused required freeze frame data storage P1092
Fuel system 1 status CL
Fuel System 2 status CL
Calculated Load Value 39.6 %
Engine Coolant Temperature 122 °F
Short Term Fuel Trim -Bank 1 -0.8 %
Long Term Fuel Trim - Bank 1 6.3 %
Short Term Fuel Trim -Bank 2 -1.6 %
Long Term Fuel Trim - Bank 2 5.5 %
Engine RPM 2029 rpm
Vehicle Speed Sensor 30 mph
Ignition TimingA dvance for #1 Cylinder 24.5 ° IntakeA ir eTmperature 54 °F
Air Flow Rate from Mass Air Flow Sensor 0.06 lb/s
Absolute Throttle Position 14.9 %
Commanded Secondary Air Status OFF

The codes don't trip simultaneously. Clear codes and watch live. Check for codes. One code set no light the second code sets the light.

I would try to track down the code that sets the MIL first as the DME considers that one more important.

I have a feeling your cold mix is off whack enough that when the car warms up and the O2 takes over there is a massive correction the other way.

That hints at a MAF problem.

Clean MAF, reset adaptations monitor trims.

:iagree:

Hello,

I have the same issue did you ever figure out what was causing the issue?

Both banks long term fuel trim indicates a lean condition that is why it is reporting +6.3% and +5.5% or adding fuel to the mixture. The short term indicates a rich condition (-%) taking fuel away from the mixture. The short term is trying to balance out the rich long term by taking fuel away from the mixture.

I would look at the 02 sensor voltage to see what are voltage range that they are varying. The data that you provided doesn't tell if the system is in open or close loop. The coolant temp of 122 F indicate that the engine is not up to operating temp.

The airflow through the MAF is .06 pound per second which means diggly squat to me since I'm on the metric unit. Converting .06 pound per second to g/s (gram per second) equates to 27.21g/s. Which to me is kind of HIGH. If I had to guess I would say your MAF is over-reporting the amount of air flowing through it. So the DME (or ECM like some people like to call it) is seeing a lean condition because of the amount of air flowing through the sensor, but the 02 sensor is reporting a rich condition. If you do decide to replace the MAF buy a Siemens MAF. Avoid the cheap no-name crap from Amazon or eBay. The other item to consider is the idle control valve. You can remove it and see if it rattles. If it doesn't rattle it could be stuck in a closed or open position.