W169: 2009 A150 (Petrol) EML came on, engine sounds like a diesel now...

[anyweb]

so the other half was in town with her A150 today and 10 minutes before her destination, the EML came on, I got it towed home. The car starts/drives but sounds like a diesel... it has oil and otherwise should hopefully survive another few years yet (238000 kilometers on the clock).

I scanned the diagnostic codes and the following were stored.

P0016 - Crankshaft Position - Camshaft Position Correlation Bank 1 Sensor A

P0325 - Knock sensor 1 Circuit Bank 1 or Single Sensor

do any of you have any ideas what this means for the car, is it toast ? do I have an expensive bill coming my way or is it hopefully something easily replaced/fixed

thanks in advance for your help/advice

 

[anyweb]

found these by googling, are they accurate ?

P0325 OBDII Code – Knock Sensor #1 Circuit Malfunction

P0325 is an OBDII trouble code indicating that the signal from the knock sensor is not performing in its normal range. See how to fix this problem quickly.

exhaustsystemsguide.com

P0325 Causes​

This failure code can be caused by the sensor itself, the engine controller, or the wiring between the two, including the connectors.

P0016 – Crankshaft position/camshaft position, bank 1 sensor A -correlation – TroubleCodes.net

www.troublecodes.net

What are common solutions to code P0016 ?​

The most common solution to this code is the replacement/repair of wiring, followed by replacement of crankshaft/camshaft position sensors if the engine timing is known to be good. Less common solutions include replacement of reluctor rings, or VVT/VCT oil control solenoids. Note that PCM failures are rare.

 

[mattkh]

Sounds like the timing chain has jumped a few teeth.
Time to replace the chain tensioner.

 

[LostKiwi]

Agreed. First place I'd look is cam timing.

 

[anyweb]

interesting that you say this as i had the cam chain tensoner replaced less than 2 years ago, should it have failed already ?

 

[LostKiwi]

interesting that you say this as i had the cam chain tensoner replaced less than 2 years ago, should it have failed already ?

No it shouldn't.
Those codes do suggest the chain has jumped though.

 

[anyweb]

ok so if it has jumped, is that a big problem (i.e. expensive) ?

 

[LostKiwi]

Depends on what's touched internally.
If valves and pistons have had a coming together then yes potentially.

I would definitely be asking whoever did the tensioner to have a look.

 

[anyweb]

oh dear, and is there any way that the mechanic can tell me this without a head off and money wasted ?

 

[LostKiwi]

Should be able to check cam timing without head coming off. Just take cam covers off to check.

 

[anyweb]

ok, let's see what he says...
thanks for the advice so far

 

[LostKiwi]

Whatever you do don't start the engine. You could easily make things worse if it's just tensioner failed causing the timing chain to rattle.

 

[anyweb]

well she drove with the light on for 10 minutes or more... and it has been started 3 times since then, to drive onto the recovery vehicle, and off again

 

[LostKiwi]

If you're lucky the chain will be hitting the casing but with it so loose it could jump teeth.