vRS 2012.

 

Last few days, after standing overnight or a few hours during the day, first start takes several engine revs before it fires. At the same time the EPC light stays on.

Once started it runs fine. I can then switch off, restarting immediately and the EPC light is out. There no loss of performance (under normal driving at least) and the last tankful returned over 57 mpg.

 

It's presently in the garage where they say they traced it to the crankshaft sensor. Now awaiting new part.

 

I was under the impression the EPC was related to a throttle issue.

I'm not saying the garage are wrong, just wondering how the crankshaft sensor fits with that?

 

 

 

Edited 18 December, 20187 yr by ProfesorDeBuceo
typo

Just as well you are not saying the garage is wrong because they know or should the various things that can have the EPC on.

Reason they go to college, serve their time and get all the gear and should have more than just an idea and get the title Mechanic or Technician and not just a fitter.

18 hours ago, Skoffski said:

Just as well you are not saying the garage is wrong because they know or should the various things that can have the EPC on.

Reason they go to college, serve their time and get all the gear and should have more than just an idea and get the title Mechanic or Technician and not just a fitter.

 

One of the reasons I spend very little time on here, and a big reason a very good friend of mine left this forum for good, is replies like that.

It doesn't answer the question and serves no purpose other than to make the poster seem clever.

As such it gets filed where it belongs.

What do you want a list of the fault codes that might or not be logged when the EPC light shows?

And the reasons for those, other than a throttle issue or a crank sensor!

 

You are paying the place or the technician so maybe ask them to explain maybe why they have decided to go with the Crank Sensor as being the cause of a fault being the cause of the light illuminating and their action to resolve things.

 

Or a more helpful than me member might help you in your education.

Edited 19 December, 20187 yr by Skoffski

My owners manual states: "If the warning light EPC lights up, there is a fault in the engine control. The engine control unit allows the vehicle to run in emergency mode." Based on that, I would imagine the EPC light will flag up for a great number of faults and one of which certainly could be the crank sensor as it'll connect to the ECU.

 

A faulty crank sensor would probably cause slow starting and hopefully they at least checked for faults or even checked the crack sensor output before deciding to replace it

Having read and digested the VAG self study guide on the PD engine and especially the quick start feature, if your TSi works in the same way then the garages suggestion of crank sensor would correspond exactly with the symptoms you describe as Langers has said.

 

The (PD) engine will run without the crank sensor but will throw up the EPC light and a corresponding fault code and the engine will take much longer to start.

 

Actually, maybe I have that backwards, its the camshaft sensor and the 2 sets of triggers on the cam pully wheel that allow the quick start, maybe its that?

 

A proper VAG or VCDS scan should show which one has failed or is faulty.

Edited 19 December, 20187 yr by J.R.

On 19/12/2018 at 13:07, Skoffski said:

What do you want a list of the fault codes that might or not be logged when the EPC light shows?

And the reasons for those, other than a throttle issue or a crank sensor!

 

You are paying the place or the technician so maybe ask them to explain maybe why they have decided to go with the Crank Sensor as being the cause of a fault being the cause of the light illuminating and their action to resolve things.

 

Or a more helpful than me member might help you in your education.

 

A wise man once said "it's better to keep your mouth shut and let people think you're a fool than to open it and prove them right". 

 

Free advice!

Thanks Langers2k & JR. In fact it was the crankshaft sensor.

 

Once replaced no more EPC light and starting is back to first time, as it should.