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Old 06-04-2008, 07:28 PM   #1
tanzi
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M54 Engine Sensors

What different types of sensors are on a M54? (i have a 2002 325i)

Idle control sensor, cam positioning sensor....... what else?

Can i replace these cheaply to help a rough start-up idle and as piece of mind?
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Old 06-04-2008, 08:34 PM   #2
EvilGenius
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Quote:
Originally Posted by tanzi View Post
What different types of sensors are on a M54? (i have a 2002 325i)

Idle control sensor, cam positioning sensor....... what else?

Can i replace these cheaply to help a rough start-up idle and as piece of mind?
There are a lot. If you just want to replace them all, you will a) spend a lot of money and b) waste most of it. It would be a better practice to get a diagnostic readout to find out what (if any) sensor is giving you static. Buuut, since you asked, all of the sensors that I can think of on an M54 engine:

2x Pre-cat O2 sensor (bank1, bank 2)
2x Post-cat O2 sensor (bank 1, bank 2)
exhaust cam position sensor
intake cam position sensor
camshaft position sensor
2x water temperature sensor (2 locations)
ICV (integrated idle position sensor)
throttle body with integrated throttle position sensor
knock sensor
oil level sensor
oil press sensor
oil temp sensor
mass air sensor

Hmm, know I'm missing some but that is the majority I think.
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Old 06-04-2008, 09:01 PM   #3
tanzi
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i just wasnt sure if there were 2-3 that should be replaced at around 70k miles if i am itching for something to do.
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Old 06-04-2008, 09:05 PM   #4
EvilGenius
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Originally Posted by tanzi View Post
i just wasnt sure if there were 2-3 that should be replaced at around 70k miles if i am itching for something to do.
Well if ya really want to The cam sensors are ~$100/ea, but that may not be the source of your problem. Better to get a diagnostic to find why your car is running rough at idle. Could just be a $20 rubber intake tube.
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Old 06-05-2008, 10:25 AM   #5
951Tom
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There is also a crankshaft position sensor and a air intake temp sensor.
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Old 06-05-2008, 12:25 PM   #6
NiceRideENT
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Is there a sensor to tell if the other sensors are bad?
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Old 06-05-2008, 01:38 PM   #7
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Is there a sensor to tell if the other sensors are bad?
^lol (insert whitty comment here)
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Old 06-06-2008, 03:23 AM   #8
abmi0000
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Originally Posted by NiceRideENT View Post
Is there a sensor to tell if the other sensors are bad?
Yup - It's called a Faulty Sensor
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Old 06-06-2008, 04:05 AM   #9
paraklas
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Originally Posted by EvilGenius View Post
There are a lot. If you just want to replace them all, you will a) spend a lot of money and b) waste most of it. It would be a better practice to get a diagnostic readout to find out what (if any) sensor is giving you static. Buuut, since you asked, all of the sensors that I can think of on an M54 engine:

2x Pre-cat O2 sensor (bank1, bank 2)
2x Post-cat O2 sensor (bank 1, bank 2)
exhaust cam position sensor
intake cam position sensor
camshaft position sensor
2x water temperature sensor (2 locations)
ICV (integrated idle position sensor)
throttle body with integrated throttle position sensor
knock sensor
oil level sensor
oil press sensor
oil temp sensor
mass air sensor

Hmm, know I'm missing some but that is the majority I think.
ICV = Idle control valve, not a sensor
Camshaft position sensor? 1 exhaust and 1 intake.
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