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Check engine light is on, help

My 2000 4.4i has the check engine light on for last couple of month. I´m in Africa and there´s no BMW assistance. Car has been running great for the last four years (before that it was in Europe and only a gearbox was required, nothing more) with no critical problems apart from the usual.
Few months ago the check engine light went on and I can feel loss of power at 4500rpm, it strugles a bit to rev after 4500rpm.

Manage to arrange a litle machine that can read the ECU and this is what it shows:
- 02 sensor circuit no activity detected
- Bank 1 sensor 2
- System to lean bank 1
- System to lean bank 2

There are several other information about the engine parameters like MAF and others, but only these this faults showed up.

Quote:

Originally Posted by J.Seven (Post 880816)

My 2000 4.4i has for months the check engine light on. I´m in Africa and there´s no BMW assistance. Car has been running great for the last four years with no critical problems apart from the usual.
Few months ago the check engine light went on and I can feel loss of power at 4500rpm, it strugles a bit to rev after 4500rpm.

Manage to arrange a litle machine that can read the ECU and this is waht is shows:
- 02 sensor circuit no activity detected
- Bank 1 sensor 2
- System to lean bank 1
- System to lean bank 2

There several other information about the engine parameters like MAF and others, but has faults, only these showed up.

Oxygen sensors monitor air/fuel. If for some reason the computer thinks its getting too much fuel, it may cause the lean situation and why you have problems at higher RPMs.

I would check your oxygen sensors. Maybe got disconnected or just bad. Also check for any air leaks along the intake tract for good measure.

Quote:

Originally Posted by TwinsPoppa (Post 880818)

Thanks for your feedback.
Where are this oxygen sensors? Will check if there´s any intake leak.

J.Seven

Quote:

Originally Posted by J.Seven (Post 880826)

Thanks for your feedback.
Where are this oxygen sensors? Will check if there´s any intake leak.

J.Seven

The oxygen sensors are near the catalytic converter underneath the X. I don't know how many but there should be ones before the catalytic converter and after.

EDIT: There are apparently 4 oxygen sensors. 2 before and 2 after the catalytic converters. I would double-check but there may be 2 converters (one for each bank/side). That's why there's 4 total.

I think bank 1 is considered passenger side and bank 2 is driver side.

I assume its a sensor because of these 2 things:
- 02 sensor circuit no activity detected
- Bank 1 sensor 2

Number 4 and Number 5:
http://www.realoem.com/bmw/diagrams/r/w/139.png

BTW.. do you have the actual P-codes? Might want to check the MAF too. Was that a typo on your first post. Did you or did you NOT get any MAF faults?

Some reads for you:

http://www.xoutpost.com/279543-post14.html

http://www.xoutpost.com/454160-post1.html

check engine light on means one or more DTCs stored in your engine control module.
so you can go to local auto store read the DTCs by free, or you can buy a code scanner read and clear the fault codes by yourself.

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