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  #1  
Old 01-22-2017, 11:34 AM
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What are normal MAF, Fuel Trim, O2 Readings for 3.0i

What are normal reading from these sensors using a tool the Torque Pro? I'm trying to diagnose a P1092 code. A local Indy shop said I needed a new MAF and new primary oxygen sensors. They also said my MAF went bad because I'm running a K&N and they got BMW code for fuel trim errors. They also performed a smoke test and found no leaks.

From the report:

TECHNICIAN NOTES:Faults stored for bank 1 oxygen sensor trimming.
Multiplicative values are extremely
high.
Performed intake system smoke test and found no leaks.
Found K&N air filter to be installed on
vehicle.
Recommend replacement of air mass meter and both primary o2 sensors with a new
OE air filter at this time.

When I talked to Bavarian Auto they said MAF was unlikely and said I should replace the CCV / oil separator.

I have a 2005 with 109K miles - the rub is that the car runs perfectly just a stupid light.

Yesterday I replaced the primary O2, new plugs, cleaned the MAF with MAF cleaner. As most know, the CCV rebuild is rather involved - not the most fun job for winter time - for now, I'm holding off or may need to get a shop to do it - I would like to replace it once spring hits since it is way overdue according to what I've read. A day or so before I got a light, I did hear a strange whistling sound on a cold day - another possible CCV clue. After the tune-up, the car seems even more smooth - but it's hard to tell - a bit like how the car seems faster after washing and waxing all day

The easy next step, would be to replace the MAF and hope for the best - but that approach rarely works. If I look at my MAF values reported in Torque, the graph makes sense to me - gradual smooth rise off idle, drops with gear change, then ramps, then drops if I let off the gas. The display lags by a second or two, but I assume that is due to the ODBII, Bluetooth, app, display.

I wish I had some baseline measures - I would appreciate if folks could post their readings for cars with no codes etc


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Last edited by btrvalik; 01-22-2017 at 11:59 AM.
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  #2  
Old 01-28-2017, 04:30 PM
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Here is plot of my MAF vs RPM - all looks normal to me:
Name:  MAF-RPM.jpg
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Old 01-28-2017, 04:34 PM
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Here is a plot comparing the short term fuel trims on each bank vs rpm:
Name:  ST12-RPM.jpg
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Old 01-28-2017, 04:37 PM
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This compares my Short Term, Long Term Fuel Trims and O2 on bank 2
Name:  B2 ST-LT-O2.jpg
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Old 01-28-2017, 04:41 PM
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This compares the post-cat O2 sensors
Name:  O2-2.jpg
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Old 01-28-2017, 04:46 PM
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Here is a plot of the pre-cat O2 sensors on bank 1 & 2 - brand new Bosch
Name:  O2 1-2.jpg
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  #7  
Old 01-28-2017, 06:54 PM
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Either your cats needs to be replaced or you need to replace both post cat 02 sensors. The graph for a post car 02 sensor should be almost a horizontal lines once the engine is in close loop. The graph that you show have the post cat 02 sensors bouncing up and down.



Here's a link to Scannerdanner video on determining a bad cat with the use of the 02 sensors pre and post cat.

https://www.youtube.com/watch?v=vyVnhCIMDnw
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Last edited by upallnight; 01-28-2017 at 08:07 PM.
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Old 01-29-2017, 01:52 PM
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I was also surprised by the irregularity of the secondary O2's - I need to replace them since they are original, but I think they are working properly. Since I never took a baseline measurement of my X5 / didn't really know what working O2 signals look like, I also grabbed the same data (using the same tool - TorquePro) from my wife's CX-9. The CX-9 run is much longer - so the cat's likely got much warmer. I was expecting a smooth line, what I got instead was something that looked a lot like my X5 but it seems to then smooth out a bit still with some good spikes.

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Old 01-29-2017, 02:04 PM
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The big difference I see between my X5 and the CX-9 is the LT fuel trim. The X-5 is sitting at 7-8 %. The CX-9 is sitting around 0 - with a lot of adjustment going on. Would love to see data on a X-5 with no codes / running great - hence the reason for the thread.

Name:  CX-9 LT fuel trim.jpg
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Old 01-29-2017, 02:34 PM
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The engine needs to be in Close Loop before the 02 sensors come into play. When the engine is running in Open loop it is following a predetermine default engine management values.
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2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD
Lotus Europa 1970 Destroyed by fire
Lotus Europa 1970 S2 Renault Powered
Lotus Type 52 1970 Twincam Webers Powered
PORSCHE 911 Targa 1982 The Garage Queen
Audi Avant donated to Kars for Kids
BMW 525IT Sold
Audi 4000CS Quattro Sold
Jensen Healey Lotus Powered Sold
Opel 1900 Sold
Triumph Spitfire 1971 Sold
Triumph Spitfire 1968 Sold
Plymouth "Cuda" 340 Six pack SOLD
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