Audi A6 C5 4.2 V8 (ARS) Running Problems / Fault Codes

[cgtechuk]

Hi All,

Hoping you can help, I have a running issue with my car (Audi A6 C5 4.2 V8 (ARS) in that it seems down in power and then it has a missfire or unsteady idle,

I have plugged in the computer and I am getting the following error that keeps coming up:-

17748 - Camshaft Position Sensor (G40) / Engine Speed Sensor (G28): Incor, Correlation P1340 - 15-00

Now does this mean I could possibly need to replace these two sensors? how is that done and are they easy to do?

Is it a problem with the timing or can these sensors being faulty cause the rough running of the car?

ALL help appreciated, Thanks

 

[desertstorm]

The camshaft and crankshaft are connected together by the cam belt, thus the timing pulses provided by these sensors should be synchronised. If there is an issue with the timing belt then this can cause a variation in the timing signals.
Also if either sensor has an issue such as intermittent or low output then this can cause the same problem.
It's most likely a duff sensor but could be either one. Usually if there are problems with either sensor the engine wil lnot function at 100% as it uses substitute values if it loses a sensor output.
How many miles has the engine done ?, when was the cambelt last changed ?.

If the belt is good then I would start by changing one of the sensors which ever is the easiest / cheapest.

http://wiki.ross-tech.com/wiki/index.php/17748/P1340/004928


17748/P1340/004928 - Camshaft Position Sensor (G40) / Engine Speed Sensor (G28): Incor. Correlation

Possible Causes
Timing Belt/Chain incorrectly installed Timing Chain probably lengthened

Camshaft Position Sensor (G40) faulty
Engine Speed Sensor (G28) faulty

Possible Solutions
Check Timing Belt/Chain installation Use Measuring Value Blocks (MVB) to Check Timing Chain

Check/Replace Camshaft Position Sensor (G40)
Check/Replace Engine Speed Sensor (G28)

Special Notes
When found in the 1.8T engine, check engine oil pressure. The oil pump pickup may be restricted.
When found in the 1.8T engine (possibly others too), check to make sure the correct G40 is installed (single gap versus 4 gap).
When found in VR6 4 Valve (BDF, BJS, BAA,) engines in conjunction with 17755 please see Technical Bulletin 15-07-03. The previous Technical Bulletin number was 15-04-01.
When found in a 30-valve V6 gasoline Audi engine (such as EPB or BEL), DTC 17755 may be stored as well. If both of these codes are displayed simultaneously, and the codes only appear after the motor is revved above 1800RPM, then the issue is likely that the cam chain tensioners were installed on the incorrect heads (drivers' tensioner on passenger head, etc).
On engines with chain driven intake camshaft(s), but belt driven exhaust camshaft(s), verify the number of chain roller links between the intake and exhaust camshafts is correct. Click on thumbnail to enlarge:

 

[cgtechuk]

engine is on 170k and is prob due a belt in the next year but i would prefer it to be a sensor lol, Is there a definitive way of telling or do i need to pull the car apart?

Where are the sensors located Are they easy to get to?