[Johnny_88]

So, I've just bought my first EOS after a few years of lusting and pretty happy with it so far BUT..
On the way home from the dealership, the emissions warning light came on. Took it back into them today and they cleared the warning - all good.
Got home and turned off the engine, and went to start it again to move but the engine wouldn't start (or, it did but died immediately).

I then locked the car, unlocked it and it started fine.

Again, turned the engine off and tried to start it again (without the lock/unlock) and no luck. Started and immediately died.

I've now also got the ECU light on.

Any ideas on what could be causing this?

It's a 2010 EOS Sport (mk1) 2.0 TSI.

Cheers

 

[FSJ Guy]

How is your battery voltage? With engine running and with engine off?

These "new fangled" cars these days (LOL!) like a fresh battery and can be sensitive to low voltage. Did the dealer tell you WHY the emissions light was on?? Seems odd to clear it without noting the reason.

Also, if you get VCDS, (www.ross-tech.com) you can read those codes yourself and not have to go to the dealer. It will read codes that ordinary OBDII readers will not. And you can reprogram some of the modules in your car with it, too.

 

[Johnny_88]

He said it was an issue with a sensor monitoring the fuel quality? Said it was likely to be because the cars been stood for a while (I was in a rush do didn't question that but sounds odd).
They've ordered a replacement sensor and due to be fitted on Tuesday, which is why he's cleared it.

No problems with the battery from what I can see - everything else works when it doesn't start.

 

[voxmagna]

You can only troubleshoot faults like yours on modern cars with diagnostics that allow the car computer to be interrogated and stored fault codes read out. The days are gone when you could change a few spark plugs and easily put things right.

Be aware the first thing the workshop will do is read your car for fault codes (ask them what they were). Then they usually clear them (dash lights out) and see if they come back. It may happen they stayed clear whilst the car was with them, but related faults came back when you got the car back. Each fault code your car stores is time and date stamped. If you take the car back and those same fault codes ocurred after they had the car, then either they didn't fix the fault first time or a different fault has occured.