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Discussion Starter · #1 ·
Can anyone help please.
I've got a solid yellow engine fault light on.
Showing code :
Bank 1 CMP sensor
(G40)/ engine speed sensor
(G28) incorrect correlation P0016
Mechanic says this is pointing to cam chain issue?
But the cam chain and tensioner were all replaced by VW specialist only 20k miles ago.
Looking to see if anyone has had anything similar
Thanks in advance for any assistance 馃憤
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Just because somebody replaced parts 20k miles ago doesn't mean it hasn't got a problem? If your mechanic now says the trouble codes point to a cam chain issue which might write off your engine, why not trust what he says, because he has the diagnostic tools and is in a better position to tell you what's going on?

I never trust what somebody said or did in the past. I only trust what I investigate and confirm myself at the time with eyes on, not what somebody elses internet post tells me who won't pay for a new engine if their advice is wrong.
 

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Discussion Starter · #3 ·
I was just enquiring as this is a VW Eos page so someone may know more about this as the mechanic doesn't deal with these cars very often his own words not mine trying to see if the code also relates to anything more specific? The car has been parked up since the engine light came on so investigation is underway before deciding what to change or not ?
 

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Diagnostics can do a lot more than just print error codes. In the right hands with somebody who knows how to use its features, it can show realtime measurement of timing. When a car is parked up for a long period of time, oil drains down into the sump. During the first cold start, the timing chain may have lost tension until oil got to it. That's when it's most vulnerable to a tooth jump? Some of these engines have hydraulic oil type tensioners and you should be concerned to eliminate any chain tensioner issues if your engine is like this (research)? During the first cold start or with lots of cranking with a near flat battery, the timing chain may have lost tension until it got oil pressure and has jumped a tooth?

V.W fit many different engines in the EOS. Mine is the 2l Tdi diesel with a belt so I don't have this problem. Research your FSI BVY engine to see what it has and if any of the many posts on the internet about the timing chain tensioners, recalls and modified parts apply to you.
 

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I was just enquiring as this is a VW Eos page so someone may know more about this as the mechanic doesn't deal with these cars very often his own words not mine trying to see if the code also relates to anything more specific? The car has been parked up since the engine light came on so investigation is underway before deciding what to change or not ?
If I'm not mistaken this is a 2.0 FSI naturally aspirated engine that has a timing belt, but also an upper cam drive chain.

Identifying the cause of the problem is a job for a VW specialist rather than a shop that doesn't work on VWs often. Why not go back to the VW specialist that did the work?
 

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If I'm not mistaken this is a 2.0 FSI naturally aspirated engine that has a timing belt, but also an upper cam drive chain.

Identifying the cause of the problem is a job for a VW specialist rather than a shop that doesn't work on VWs often. Why not go back to the VW specialist that did the work?
Yes BVY has a belt. Problem is still the same, needs a mechanic who's expert using V.W diagnostics to investigate the timing discrepancy (if real) and if the sensors are giving their correct synchronised outputs.
 
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