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Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 12-16-2011, 02:20 AM   #1
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p1397 Cause?

I've read all of the threads about "likely" scenarios which may lead to the lean condition error code, but does anyone know what causes the code to be reported? In the code of our ECUs there is a very specific event and threshold which results in p1397 being reported.

Example: with other engines there are known limits for O2 or MAP readings, which if exceeeded, would cause a similar code to be reported. Does anyone happen to know this trigger event for BMW?
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Old 12-16-2011, 06:21 AM   #2
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Isn't P1397 a code for the exhaust cam sensor?

BMW Code P code
18 P1397
Exhaust cam Input analog Internal
check of phase shift from position sensor malfunction
phase shift (0-5V) camshaft sensor - should change during every crankshaft
revolution. Phase shift occurs due to 2:1 relationship between camshafts.
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Old 12-23-2011, 09:42 PM   #3
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have the same issue in a 2002 325 E46,,I replaced the sensor for an aftermarket one,,the code desapear for a while,,but I decided to drive the customer car home and after 15 minutes driving the light came back,,I was driving with my Autel Maxidas DS708 scanner when.the same code shows up,,is possinle that the aftermarket sensor is another issue ???

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Old 12-23-2011, 09:45 PM   #4
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but my generic code was P0365,BMW Exhaust Positon Sensor signal

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