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Big "J"
01-17-2008, 06:43 PM
I have an 03' X5 3.0i and on my way home from work with engine fairly warm....34 deg. outside, the "service egine soon" light came on. I stopped at Autozone to have them scan it and it came up, Po171 (bank 1 too lean, Po174 bank 2 too lean. Bank references a group of cylinders. I didn't htink to have the guy reset them. Also, I was curious that it might be the O2 sensors.

I went to another autozone and had them try to scan it as well to see what they got and reset it to see if the same code would come up. He attached the scan tool and wasn't getting anything. We unplugged the tool and started it up and no "service engine soon" light. Sweet!!!

We suspect the O2 sensors were squirrely and shot a code. The tech suggested to put some fuel injector cleaner in and that should do the job. I hope so!

Zulu95
01-18-2008, 08:03 AM
Could also be the rubber boot on the "Throttle Body". It is on the driver's side of the engine.

Big "J"
01-18-2008, 08:22 AM
Good idea.... I'll let you know.

Thx