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Old 08-02-2019, 02:37 PM
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04 X5 Lean Codes

Hi, I'm having an idle/misfire issue with my N62 X5.

I'm getting the following codes.

P2187 Too Lean at Idle bank 1

P2179 Too Lean Idle Bank 2

P0040 Oxygen sensor signals swapped Bank 1 Sensor 1, Bank 2 Sensor 1

I've put a new fuel filter in and tested fuel pressure and checked out fine. No vacuum leaks that I'm aware of.

That one code says that the O2 sensor wires have been swapped not sure whats going on there as the wires haven't been touched.

What should be the next thing to be replaced? Both upstream O2's??
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Old 08-02-2019, 09:29 PM
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The erorrs say specifically that the wires to the pre cat O2 sensors are swapped.

Swap the connectors, clear the codes and see if any come back
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Old 08-03-2019, 12:44 AM
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Swapped them and it ran worse. Iím putting in new O2ís tomorrow.
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Old 08-03-2019, 09:48 AM
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Quote:
Originally Posted by Rxpx View Post
Swapped them and it ran worse. Iím putting in new O2ís tomorrow.


I wasn't positive which was bank one v two so I unplugged one to force an error and determine positively


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Old 08-04-2019, 08:06 PM
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Quote:
Originally Posted by Rxpx View Post
Hi, I'm having an idle/misfire issue with my N62 X5.

I'm getting the following codes.

P2187 Too Lean at Idle bank 1

P2179 Too Lean Idle Bank 2

P0040 Oxygen sensor signals swapped Bank 1 Sensor 1, Bank 2 Sensor 1

I've put a new fuel filter in and tested fuel pressure and checked out fine. No vacuum leaks that I'm aware of.

That one code says that the O2 sensor wires have been swapped not sure whats going on there as the wires haven't been touched.

What should be the next thing to be replaced? Both upstream O2's??
99% of lean codes are usually associated with a vacuum leak. Just because you're not aware of a vacuum leak doesn't mean there isn't one. The CCV at the rear of the intake manifold would be one of the first place I would look.
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Old 08-06-2019, 01:42 AM
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Quote:
Originally Posted by upallnight View Post
99% of lean codes are usually associated with a vacuum leak. Just because you're not aware of a vacuum leak doesn't mean there isn't one. The CCV at the rear of the intake manifold would be one of the first place I would look.
I put two new CCV's on top of the valve covers. Does the N62 have the one on the back of the engine as well?
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