No power on way home huge flat spots

[Scotia]

Hi guys, owned a 04 missano red C5 rs6 avant now 3 years . Very happy motoring today from Glasgow to Kinross today admittedly not holding back the horses on the motorway then on way back around 2 miles from Glasgow slowing down to city driving car dies on me pulling away from traffic lights then after 10 to 15 seconds of no power whoosh power on for a minute then dies when I slow down.? Any ideas would be appreciated been a joy to own but got me stumped. Thanks

[Jayjay101]

Boost leak? Or fuel pump on the way out?


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[Scotia]

Thanks mate will have a look under bonnet in the morning see any hoses loose and ask local garage to have look for me as well tomorrow. Cheers!

[Shoppinit]

Could be a lot of things. First thing to do is see if there are any fault codes then check the requested boost with the Vagcom.

Also FON.

[Daveperc]

I'd put money on one of the I/C hoses having popped off. Good luck

[Mark-RS]

I'd put money on one of the I/C hoses having popped off. Good luck

This is all mine was.

[Scotia]

Original fault codes from Generic OBD2
P0445 – Evap (N80) – Circuit shorted
P0418 – Relay for Secondary Injection (J299) – malfunction
P0414 – Secondary air injection system valve (N112) – Shorted
P0057 – Lambda B2 S2 – short to ground
Poo37 – Lambda B1 S2 – “” “”
P0031 – Lambda B1 S1 - “” “”
P0102 – Mass air flow (G70) Signal too low
P1073 – manufacturer specific code – Cant find anything on this (doesn’t show in logs)
P0051 – Lambda B2 S1 – Short to ground
P0141 – Lambda B1 S2 – Malfunction – this may not show now due to codes being cleared – may be working
P0161 – Lambda B2 S2 – Malfunction – AS ABOVE

[Scotia]

Not had any time to get near car this week so Just managed to get a friendly local guy to pop out tonight and have a look at codes . He has cleared the codes but we took photos before we cleared codes car is still rough idle but will drive now with no boost at all so was thinking of starting have a look at air box then replace mafs just to rule them out as no boost and rough idle sound like maf possibly . Take it from there I think .

[Shoppinit]

P1073 is Air mass meter 2.

Lots of stuff going on there. So that's both your MAFs, your lambda sensors, N80 and SAI system that's shat itself.

Need to see what codes comes back. Some of those could be very old and no longer relevant.

[PipRS6]

Lots of short to ground and low signal codes. Maybe a part of the wiring harness has worn through or been cut???

[Shoppinit]

Lots of short to ground and low signal codes. Maybe a part of the wiring harness has worn through or been cut???

Has Jayjay been anywhere near your car?

[Scotia]

Don’t know a Jayjay , but removed air box this morning to have a look , could only see wiring on end of plug for both mafs the rubber grommet looks cut looks like someone had a nosey to if connections were ok but had the car a few years and not aware any one looking at mafs as never had this fault been running great for three years replaced timing belt and water pump etc a year ago new discs pads Xmas .ordered two mafs for tomorrow rule them out first . Take it from there

[Scotia]

Not sure but no noise coming from pressurised fuel pump underneath rear of the car normally hear it prime when ignition on but quiet so checked fuse it’s ok ,not sure at this point .

[Ben_r1]

Mine definitely hums for the first few seconds every time ignition is turned on. Could be your problem?