Question about 2001 Oldsmobile Alero

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Where is the cam shaft position sensor located?

I have a service engine soon light on and the code says failed cam position sensor. Need to know if I can replace it without taking a whole lot apart?

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It's not that hard to replaced, and can be done with common tools.  3.4 camshaft sensor removal:
Remove the serpentine belt, Disconnect the sensor wire harness, Remove the power steering pump (just remove it from the mount and out of the way), Remove the attachment bolt to the sensor, Remove the sensor, (note spray around the sensor with brake parts cleaner before removal to keep dirt from entering the engine)
To install: Lubricate the new O ring with engine oil before installing the new camshaft sensor, Tighten the retaining bolt to 8 ft.lbs.  connect the sensor's electrical wire, reinstall the power steering pump, reinstall the serpentine belt. 
Start the car and go out for the night with the money you just saved, You can pick up the camshaft sensor at Auto Zone and they can also give you the step by step instructions to getting the job done. Good luck and hope this helps. Take's just under 1 1/2 hour to do. You can do it in under 1 hour though if your good with tools. 

Posted on Jul 01, 2009

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Which engine do you have? The 2.4 liter inline 4 or the 3.4 v6? On the 2.4 , the sensor is located in front side top section of the motor. It is located slightly below where the cover that say's 2.4. It has a single bolt that clamps it in and by unclippping the wire, removing the bolt, prying the old sensor out one with a screw driver, lubricate the new one and reassemble. Total time is far less then changing a spark plug.

Posted on Jul 02, 2009

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That s an internal part engine have to be taken apart

Posted on Jul 01, 2009

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1 Answer

Where is the cam sensor in a 2002 nissan quest?

HI Chuck! The cam position sensor is inside the distributor on the quest. If the cam sensor has gone bad you need to replace the distributor assembly as it is not servicable. Before replacing the distributor, take the cap off and make sure the rotor is turning when you crank the engine. If it is not then check the timing belt as the distributor is driven by the cam shaft. If the belt is broken the cam shaft will not turn and you could get this code.The cam sensor is located under the plastic cover located under the rotor button

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What causes the CPS to go bad repeatedly in a 2001

USA car or the Export?

tell me what CPS means. we dont use that name since 1990

no engine stated, so how would we answer such a questions.

4.0L or 4.7L or 5.7L ?engine.

my guess is the cam sensor? or the crank sensor?


how often once a week, decade, ?

all parts on care fail repeatably say in 100 years

but my guess i means, inside 5 years, but what, do say.

clear facts make answers very easy.

my wild guess.

The Camshaft Position Sensor (CMP) on the 4.0L 6 cylinder engine is bolted to the top of the oil pump drive shaft assembly. The sensor and drive shaft assembly is located on the right side of the engine near the oil filter.

The Camshaft Position Sensor (CMP) on the 3.7L V6 engine is bolted to the front/top of the right cylinder head.

The Camshaft Position Sensor (CMP) on the 4.7L V-8 engine is bolted to the front/top of the right cylinder head.

The Camshaft Position Sensor (CMP) on the 5.7L V8 engine is located on right side of timing chain cover below alternator.

The Crankshaft Position Sensor (CKP) on the 4.0L 6 cylinder engine is mounted to the transmission bellhousing at the left/rear side of the engine block The CKP on the 3.7L, 4.7L and 5.7L engines is located at the left rear of the engine just above the starter motor.

now may guess based on those 2 sensors above.

the CAM SENSOR (in pure english) fails for heat.

all have a tendancy to fail for too much heat,

and for overheating the engine.

the closer it fits the the engine, the more likely it will fail. (heat)

some that fit to cam ends love to fail soon., heat.

failure mode 2 is overvoltage.

if the Alternator goes bad and overvoltage , in fact over 15v

any electronic part can fail, even light bulbs.

mode 3

using a pressure washer can wreck just about anything made.

mode 4

dropping it to the concrete,

you, others, or the shipper,

mode 5

a dumb ,mechanci , hot wired it and burned it up, or injured it. (called the walking wounded)

that pretty much covers it.

but what sensor exactly and what engine.

and how long did it last in months

Oct 15, 2014 | 2001 Jeep Cherokee

2 Answers


PCM= Powertrain Control Module. It is the brains of the car, it reads the sensor in put from all sensors including the cam shaft position sensor

If you need further help, reach me via phone at

May 14, 2014 | 2004 Toyota 4Runner

1 Answer

How can I replace a cam shaft position sensor in a 2007 Ford Five Hundred

A check engine light or MIL Lamp, indicates a
possible System Fault has occurred

You Check for Codes

The Codes direct you to a System

You then need Factory Diagnostic & Emission Manuals,
so you can TEST Sensors or Wiring that may be the fault

Codes therefore do not tell you any parts has failed
Only knowledge of how that part works & how to test it,
will result in the possible need to replace,has to fail a test first

There are other reasons for codes, than just sensors, even
thought the codes indicates one

You can not work on that high tech car yourself

Oct 18, 2012 | Ford Five Hundred Cars & Trucks

1 Answer


The Cam Position Sensor is a common item to fail. However, the cam positioning mechanism can fail too giving that code.

There are two sensors and the Exhaust Cam Sensor is most common to fail. I always replace both.
Te CKP's are on the top front of the engine next to the cylindrical operation solenoids.

Knock sensors fail too and need checked or correct feedback to ECU with a scanner.
Find a shop near you at

These engines require regular oil changes with quality synthetic oils and OE filter....not a FRAM or WIX !

Buy only BMW sensors ...aftermarket have high failure rate.

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Service engine soon light blinking /car backfiring and missing

If your check engine light is blinking, you can take your car to Autozone, Advanced Auto or other parts house and ask them to get the engine codes. This ios a FREE service. It sounds like your camshaft positioning sensor, Cam Positioning sensor is bad. This is how comuterized systems tell where the cam and crackshaft are to set the timing. It sounds like you have timing issues.

Mar 22, 2010 | 1999 Chevrolet Camaro

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Cam Shaft Position Sensor Replacement

no it is not difficult but you can try to see if they have your car listed for diagrams pictures and step by step instructions if your car is not listed then try your local library they have all the car manuals and even copy them for you

Mar 18, 2009 | 1998 Ford Escort

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Service engine soon light on. failed aircare.showing code po341 .

The service engine light DOES NOT mean change your oil. The change oil or maintence required light means change oil. The service engine light is the same as a check engine light and means that there is something (not always really bad) is going on with your motor and need someone that has a code reader to let you know what the code is. Yes that code is a camshaft position sensor code. It is located on the passenger side of the engine in the "valley" between the two cyclinder heads. Its not too hard as long as you have some tools and some skills. Its easiest to remove the serpentine belt and remove the bolts for the power steering pump. That way you can move the pump a little to gain better access to remove the cam sensor. Just replaced one yesterday on a 99 century. Hope that helps!

Dec 16, 2008 | 1999 Buick Century

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