hi Guys

 

To the untrained eye it looks like the camshaft sensor on my car needs replacing.

2008 2.0 TDi Scout Engine code is BMM

 

Noticed that occasionally the car took longer to start, it was and still happens intermittently.

Scanned the car using VCDS and saw the following:

Address 01: Engine        Labels: 03G-906-021-BMM.clb
   Part No SW: 03G 906 021 SS    HW: 03G 906 021 AB
   Component: R4 2,0L EDC G000SG  1302  
   Revision: --H07---    Serial number: SKZ7Z0G4592276
   Coding: 0000172
   Shop #: WSC 66565 257 00032
   VCID: 020BABA95DC6D12E68-8056

1 Fault Found:
012295 - Camshaft Position Sensor (G40)
               P3007 - 000 - No Signal - Intermittent
             Freeze Frame:
                    Fault Status: 00100000
                    Fault Priority: 3
                    Fault Frequency: 254
                    Reset counter: 255
                    Mileage: 209491 km
                    Time Indication: 0
                    Date: 2000.00.00
                    Time: 08:29:21

             Freeze Frame:
                    RPM: 1449 /min
                    Speed: 50.0 km/h
                    Load: 14.9 %
                    Voltage: 14.44 V
                    Bin. Bits: 00101000
                    Idle Stabilization: -2.9°KW
                    (no units): 48.0

Readiness: 0 0 0 0 0

 

So reset the fault code and ran another scan and got

 

Address 01: Engine        Labels: 03G-906-021-BMM.clb
   Part No SW: 03G 906 021 SS    HW: 03G 906 021 AB
   Component: R4 2,0L EDC G000SG  1302  
   Revision: --H07---    Serial number: SKZ7Z0G4592276
   Coding: 0000172
   Shop #: WSC 66565 257 00032
   VCID: 020BABA95DC6D12E68-8056

1 Fault Found:
012295 - Camshaft Position Sensor (G40)
               P3007 - 000 - No Signal
             Freeze Frame:
                    Fault Status: 01100000
                    Fault Priority: 3
                    Fault Frequency: 3
                    Reset counter: 255
                    Mileage: 216572 km
                    Time Indication: 0
                    Date: 2000.00.00
                    Time: 10:42:01

             Freeze Frame:
                    RPM: 798 /min
                    Speed: 0.0 km/h
                    Load: 0.0 %
                    Voltage: 14.36 V
                    Bin. Bits: 00101100
                    Idle Stabilization: 0.0°KW
                    (no units): 48.0

Readiness: 0 0 0 0 1

 

To me this is pretty conclusive, and the sensor needs replacing.

I've had a quick look in the Haynes manual which says that the cambelt needs to to come off in order to get access to the sensor.

Dealer says the part is £101, or supplied /fitted for £350

1. Are the scan logs conclusive and the sensor needs replacing?
   1. Are there other tests that need to be done?
2. Does the cambelt need to come off to do this job?
3. Can I do this job myself
4. Has anyone know of a guide on how to change the sensor.

Thanks in advance

 

Why would a fault code that the sensor isn't receiving a signal be conclusive? Although quite likely it's still guesswork, fault codes are not the be all and end all. That fault code means at some point the engine ECU has been unable to see a signal from the sensor. This could be due to the sensor, the camshaft pulley, the wiring loom or the ECU itself.

The fact that it's intermittent could give indication that it's not a hardware issue. If the pick up had fallen off the pulley for example it would be a permanent fault, probably a correlation issue with the crank sensor too.

On the single cam 8v the cambelt doesn't have to come off, the sensor can be fed through a grommet hole in the rear cambelt cover. Fairly straight forward to do, I would think if you are fairly handy I would think you could change it. Just don't drop the bolt holding it in down the cambelt.

Edited 1 April, 201610 yr by Tech1e

Thanks  @tech1e

Should the need arise - gives me a bit more confidence to do the job myself

 

Assuming that the sensor isn't replaced, what's the worst case scenario - it will fail completely one day and the car will not start or does the ECU use some base line value or the crankshaft sensor and some base values?

 

If the fault repeatedly shows up after resetting/clearing, is there anything else to check before getting a new sensor?

In theory as the cam sensor is just used for cylinder recognition for quick start then you will just get a longer crank time (due to it taking more turns of the crank for the ECU to find TDC). However you can get issues that give a wrong signal rather than no signal, this might confuse things to the point that the engine won't start. In this situation unplugging it should resort to crank signal only.

Thanks again @Tech1e for the info - sound advice re unplugging the camshaft sensor if I get stuck!

 

 

In theory as the cam sensor is just used for cylinder recognition for quick start then you will just get a longer crank time (due to it taking more turns of the crank for the ECU to find TDC)

 

That scenario does fit for my car.

Intermittently, the engine cranks over for a number of seconds before starting. Next time starts instantly...

Forgot to update this post.

Fitted a new camshaft sensor cable supplied by Mike (@Skoda4Life)

 

Fault code gone and car starts perfectly hot or cold everytime.

 

The job was quite easy, just a bit of care needed.

Sprayed the electrical connector with contact sparay before assembly.

 

Hi I'm  having  trouble to locate my crankshaft sensor been under the car for hours but still cant find it its a Skoda Octavia mk2 automatic 1.6 2005 can anyone help please 

I’m hving the same problem on a 2lt Petrol. I’ve looked all over and can’t find it haha

On the Scout TDi (BMM) engine the sensor is  just behind the edge of the cambelt and the cable comes round the front of the engine and plugs into the loom with a grey plug, it could be in the same place on the petrol.