Going to work today engine sounded slightly gruff, with an occasional misfire. No warning lights showing, so thought it was just poor air/excess pollution from the lousy overcast we had in NW London this morning.

This evening, the EM light came on during the trip home and stayed on despite a couple of restarts - engine slightly down on power.

VAG Com scan showed that found fault in the EGR system, fault code 16786, excessive flow

and also, strangely, an airbag fault, 000532 - supply voltage B + 07-10 - Signal too low intermittment.

No other major faults showed.

It was misfiring at idle during the scan.

I haven't seen these faults with previous scans.

Any ideas what's happened ?

Vehicle battery replaced with new 62 AH Varta about three weeks ago.

Scan attached

Nick,

12/07/07

16786/P0402/001026 - Ross-Tech Wiki

Cheers !

I've just tried to get the engine - cover off to have a look to see if any hoses/ wires are adrift. But I can't do it. The Haynes manual (Section 2B 4) seems to apply to a different model - removed the skoda badge and there's no recess underneath as the manual describes.

Mines the 100 BHP saloon.

Help !

Nick

12/07/07

and also, strangely, an airbag fault, 000532 - supply voltage B + 07-10 - Signal too low intermittment.

This might not be related at all but funny you should mention the air bag and a missfire.

On my 106 I used to have the EM light come on halfway through a long mway run say about 100 miles then it would click on apparently it was a missfire. It then started doing it every mway journey but the light kept switching it's self off eventually.

Now the weird bit in the last couple of months of having the car the air bag light started coming and off then in the end it never went off.

Is the missfire and air bag linked in a strange way.

Cheers !

I've just tried to get the engine - cover off to have a look to see if any hoses/ wires are adrift. But I can't do it. The Haynes manual (Section 2B 4) seems to apply to a different model - removed the skoda badge and there's no recess underneath as the manual describes.

Mines the 100 BHP saloon.

Help !

Nick

12/07/07

Thats because the engine cover with the recess under the badge is for a 1.4 MPi. Different engine. Now I know your engine is a 16v (you didnt mention) it opens up so new avenues of diagnosis. I'd remove the engine cover (just pops up) and have a look inside the throttle body, how does it look?

You could try testing it through VAG COM, (engine not running) 01 - engine, 03 - output test - this will actuate various engine controls in turn - listen for any activity from each one especially the egr valve - if it doesn't make a noise it could be stuck, but it always pays to check the wiring first. I have known the loom that goes up to the ECU to get water logged within the insulation with all sorts of wierd symptoms. As everything works off a fraction of a volt it only takes a small voltage loss to make a big difference.

The airbag fault will be a result of your recent battery problems.