Help needed with fault code

4.2 V8 40v biturbo - 450 bhp
4.2 V8 40v biturbo - 480 bhp (plus)
Frazz82
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Help needed with fault code

Post by Frazz82 » Sun Jul 04, 2021 5:55 pm

I've had the engine light come on a few times recently and every time it comes up the fault code in the picture. I clear it and its ok for afew weeks then comes back on.

Thinking of changing the N80 valve but does anyone have the part number please.
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Shoppinit
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Re: Help needed with fault code

Post by Shoppinit » Sun Jul 04, 2021 6:38 pm

I think it's 077133517C.

But what makes you think it's the valve? Could be the carbon canister that's blocked. Or you could have a vac leak.

You can test the valve with the Vagcom output tests. I would do that first. At the very least it'll help you locate the valve from the clicking. Assuming it works, of course.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

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live.marc
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Re: Help needed with fault code

Post by live.marc » Fri Jul 09, 2021 3:33 pm

Yes, I'm going to add this if i may - and thank anyone for any help in advance :-)

Got these codes after fitting ITG performance air filters, anyone with any reasons as to what could be the problem are welcomed.

I may have snagged a wire or not seated the mafs properly, but not sure. There doesn't seem to be any consequences in real road use, apart from my ESP (electronic stability program?) not working now.

18265 - Load Signal (re brakes?)
P1857 - 35-00 - Error Message from ECU

16486 - Mass Air Flow Sensor (G70)
P0102 - 002 - Signal too Low - MIL ON

17535 - Fuel Trim; Bank 1 (Mult)
P1127 - 002 - System too Rich - Intermitten
2003 RS6 C5 Avant Black on 19's

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Shoppinit
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Re: Help needed with fault code

Post by Shoppinit » Fri Jul 09, 2021 6:30 pm

You've probably killed your MAFs with the filter oil.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

Frazz82
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Re: Help needed with fault code

Post by Frazz82 » Wed Jul 14, 2021 10:05 am

Shoppinit wrote:
Sun Jul 04, 2021 6:38 pm
I think it's 077133517C.

But what makes you think it's the valve? Could be the carbon canister that's blocked. Or you could have a vac leak.

You can test the valve with the Vagcom output tests. I would do that first. At the very least it'll help you locate the valve from the clicking. Assuming it works, of course.
Morning mate,

It just seems the easiest thing to change first 😀. I will check the other things first to try an pin point it.

One thing to add after a while of stopping an starting the engine while out driving it will be sluggish to start.

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Shoppinit
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Re: Help needed with fault code

Post by Shoppinit » Wed Jul 14, 2021 10:15 am

Might want to check your fuel pressure regulator then. Suspect it's too different problems.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

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live.marc
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Re: Help needed with fault code

Post by live.marc » Sat Jul 17, 2021 1:36 pm

live.marc wrote:
Fri Jul 09, 2021 3:33 pm
Yes, I'm going to add this if i may - and thank anyone for any help in advance :-)

Got these codes after fitting ITG performance air filters, anyone with any reasons as to what could be the problem are welcomed.

I may have snagged a wire or not seated the mafs properly, but not sure. There doesn't seem to be any consequences in real road use, apart from my ESP (electronic stability program?) not working now.

18265 - Load Signal (re brakes?)
P1857 - 35-00 - Error Message from ECU - this is now sorted after changing brake pads on front.

16486 - Mass Air Flow Sensor (G70)
P0102 - 002 - Signal too Low - MIL ON -

17535 - Fuel Trim; Bank 1 (Mult)
P1127 - 002 - System too Rich - Intermitten

The other day however was driving 70 odd and then it started to lose power. I pulled over, and it started again was ok, but took it easy till i got to work.

Shoppinit you mentioned killing the mafs with filter oil? Is that the ITG ones? Didn't realise they have oil in them.

I did clean the mafs with special maf cleaner.

Could it be an ECU problem?
2003 RS6 C5 Avant Black on 19's

Mɐʇʇ
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Re: Help needed with fault code

Post by Mɐʇʇ » Sat Jul 17, 2021 1:52 pm

Yeah, the ITG foam filters are exactly designed for oil.
IIRC “as shipped”, they are dry though? I have one on the LR.

But if you run them dry, your filtering is basically only to stop small children being sucked in. And if you run them wet, your MAF dies.
IMVHO on our cars, paper filters are the right choice. It’s not like the old days where the paper filters were restrictive.
"not a professional engineer, mechanic and mechanist"

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Shoppinit
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Re: Help needed with fault code

Post by Shoppinit » Sat Jul 17, 2021 3:25 pm

Yup. OE paper filters FTW. There's nothing to be gained on the C5 with any other type of filter. Except headaches.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

Frazz82
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Re: Help needed with fault code

Post by Frazz82 » Wed Jul 21, 2021 1:49 pm

Is it possible to strip the carbon canister an clean it out ?

I ve noticed it only brings the light on once the car has been idling for awhile an also when the weather is red hot like it is now.

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Shoppinit
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Re: Help needed with fault code

Post by Shoppinit » Wed Jul 21, 2021 4:08 pm

Nope.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

Frazz82
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Posts: 213
Joined: Thu Jul 18, 2019 9:59 am

Re: Help needed with fault code

Post by Frazz82 » Thu Dec 09, 2021 10:27 am

Is there measuring blocks I can to help pinpoint the issue ?.

I have had my DIS replaced and I can select groups while driving.

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Shoppinit
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Re: Help needed with fault code

Post by Shoppinit » Thu Dec 09, 2021 11:27 am

There is some stuff in block 70.

There's a basic setting for that group, too, which will start a test procedure.

Before doing anything, though, I would check that the solenoid is opening and closing (or at least trying to) using the output tests.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

Frazz82
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Posts: 213
Joined: Thu Jul 18, 2019 9:59 am

Re: Help needed with fault code

Post by Frazz82 » Thu Dec 09, 2021 9:27 pm

How do you perform the output tests ?

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Shoppinit
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Re: Help needed with fault code

Post by Shoppinit » Fri Dec 10, 2021 11:05 am

Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

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