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  #11  
Old 03-14-2019, 03:00 PM
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I actually would try to find the issue now. Adding variables rarely simplifies troubleshooting.
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  #12  
Old 03-14-2019, 03:25 PM
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It seems very common that codes triggered by an out of spec O2 reading end up being something other than the O2 sensor, so yes, I would not assume new sensors will fix it. Since your code said bank 1, pre-cat, you might try to just swap the two pre-cat sensors and see if the code changes. Those sensors are easier to change than spark plugs - should only take a couple of minutes - done from above.

Some data from my 2001 3.0i that may help:
Intake boot, 13-54-1-440-102, was replace by the PO at the dealer at 158k miles. Then at 184k miles, I got codes P0171 and P0174 (bank 1 and 2, system too lean) which I easily traced to a ~1" tear in the intake boot. Replacing that fixed it. So for me, that boot only lasted 26k miles and 5 years.

I replaced the original pre-cat O2 sensors (Bosch 13477) soon after getting the car at around 169k miles in a futile dream of improving MPG. No codes before or after, no change when putting the new ones in.

EDIT - also I noticed you say it is in an X3. Do you know what differences there are between the M54B30 in the X3 vs. X5? (and my part numbers above are for the X5)
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Last edited by oldskewel; 03-14-2019 at 03:32 PM.
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  #13  
Old 03-14-2019, 03:44 PM
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Ok good advice, I think I'm going to pull the intake boot and have a look, also thinking of putting in a bottle of fuel injector cleaner. Thx again. I will update as I figure it out.
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  #14  
Old 03-15-2019, 01:55 PM
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Quote:
Originally Posted by rwm514 View Post
I'm wondering if I should start with replacing the o2 sensors or try more diagnostic work to see if its a vacuum leak. What do you think?
If the 02 sensors is indicating a "Rich" condition they are fine. You can verify this with a scanner that can read real-time data. The front sensors before the cat should show a variation in the voltage, while the voltage at the back of the cat should be constant.

Why do people always blame the 02 sensors for a rich or lean condition?

This just tells me that they know nothing about how to fix a car.

Here's a video on good 02 sensors on an X5.

https://www.youtube.com/watch?v=zyh_4SktmFM
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Old 03-15-2019, 02:06 PM
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Here's a video on Short term and long term fuel trims plus voltage on the 02 sensorshttps://www.youtube.com/watch?v=WMSM7WAbBss before the cat.
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2006 Infiniti G35
2001 BMW 3.0I E53 X5 Build date 08/2000
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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