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1,6,7,8 - Series and Mini Cooper General Chat related to models that do not fit into particular categories above. Please try to put your discussion in more appropriate sections. This section does cover the 1 Series, MINI Cooper and 8-Series vehicles: BMW 830i, BMW 840Ci, BMW 850i, BMW 850Ci, BMW 850CSi, M8, Alpina B12, BMW CS Concept and others.

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Old 04-06-2004, 07:40 PM   #1 (permalink)
cai
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Join Date: Mar 2004
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I bought a diagnostic tool for my 1999 - 740i since I was having problems with the "service engine soon" message coming on for the last 2 months. Last night the tool cleared the message and also gave a code number - Table 0F - code A4 "ambient pressure sensor".

1.- Does anyone know what this means?
2.- Where is this sensor?
3.- Is this an indication of a lean or rich mixture?
4.- What ambient is it reading? I have had the car for 2 years at the same location, with no sea level changes.

I installed a K&N air filter last week in anticipation of air intake problems, but the message still keeps coming on.

Thank you.
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Old 04-09-2004, 04:33 PM   #2 (permalink)
cai
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My previous diagnosis with the resetting tool was incomplete. I have done a new diagnosis and have the following information:

Table 0F in the tool manual:

Hexadecimal tool code BMW dealer code
A4 - ambient pressure sensor 164
1A - mix control, off idle cylinders # 1-4 26
1B - mix control, off idle cylinders # 5-8 27

The dealer calls the codes 1A and 1B:
code #26 - multiplicative mixture adaptation bank 1, control limit reached
code #27 - multiplicative mixture adaptation bank 2, control limit reached
code #164 - atmosphere pressure sensor

This could be a sticky PCV valve. Does anyone know if these cars have a PCV valve that could be clogging or sticking and where it is?

Thank you.
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