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feeblington

6n2 p0420 p0401 p0106

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feeblington

Hello again.

Yet more lemony goodness from my pile of bolts

I have the errors mentioned i have an aua engined 6n2 and have checked my 02 sensord and map and they are working. Soneone suggested to check the vacuum hoses and clean out the egr. Can anyone point me where to start. No idea where the vacuum hoses are and how to remove the egr. Is there a knack or an order to removing?

Any help or suggestions would be awesome as im at my wits end. Oh and the ecm light came on too 

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dvderlm
feeblington

Thank you. I seem to have trouble finding anything!

Cheers again 🙂

ive so far  sorted the 420 as was just wiring plug loose. As for egr ive got it off and its gunky as hell so im gunna clean all the pipes and it. Hopefully wont need to replace.

Now. The map/thrust sensor.

how do i get to this on an aua engine?

i think i can just about spot it hidden near the dipstick. I just havnt anything to go on.

cheers again again :D

 

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nige8021

The MAP/IAT is on the end of the inlet manifold (by dipstick) held in with two torx screws, when you remove it be careful to not drop the "O" ring, clean it with a spray carb cleaner don't use a brush or anything similar as they are quite delicate 

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feeblington

Sweet. Can i get to the map sensor without removing the dipstick and surrounding pipes? It looks well tight

 

Little update. Had the egr valve cleaned and pipes cleaned...still came up with error 401 after 6miles. Deffo need a new one haha.

 

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nige8021

You can get at the sensor without removing anything but it is a bit tight on space, especially if you have JCB shovels for hands but a 1/4" ratchet and the torx bit it is do-able 

 

Before you condemn the EGR valve, take the main engine disconnect connectors apart (by the thermostat housing) and give the pins/sockets a spray with contact cleaner (not WD40)

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feeblington

Ill give the cables a spray.. is it the group of plugs near the dis? 

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feeblington

And again thanks ill try find my 1/4 rachet 😯 

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nige8021
1 hour ago, feeblington said:

Ill give the cables a spray.. is it the group of plugs near the dis? 

 

They are down by the thermostat housing near the battery tray

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feeblington

So the cables are pretty immaculate. Haha

And another update. Pulled egr off again and tried moving the valve. Seems jammed midway. 

Also i managed to get my hand in by the map and pulled plug out. Gave spray of contact cleaner.

Ive done around 200miles since that and only error is 401. Fingers crossed thats all it was. Car has also not had a "hiccup" or whatever its called.

However seems a bit low on power. Almost like the last 1/3 of pedal motion makes no difference. This has been gradually becoming more noticable for last month or so. And after a quick google points to egr or 02 sensor (which btw had an error about 1.5k ago for high voltage on post 02 sensor but error has never returned).

You reckon the lack of power is or could be egr related.?

Cheers

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feeblington

More update . After another clean the p0401 hasnt come back.

However p0138 is now appearing. 30second after i turn engine on. Every time.

Im aware this is post 02 sensor high voltage.

Any ideas where to start looking for problems. Also where is this 02 sensor located?

Cheers again

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vwfan3
1 hour ago, feeblington said:

More update . After another clean the p0401 hasnt come back.

Cheers again

After the clean, did the EGR valve still jamm midway, or did it move full way.

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nige8021

Does your code reader give live results ? if it does you can see what the post cat lambda voltages are. The sensor is just behind the main cat https://volkswagen.7zap.com/en/rdw/polo+derby+vento-ind/po/2000-240/2/253-253050/  

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feeblington

No i have a fairly crap code reader. 

401 is back and no it didnt move full way. So im going to replace that soon as i get round to it.

As for post cat sensor. Ill have a look this weekend when i get some time. Cheers again ill update soon 🙂

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feeblington

So i had a look underneath and coulsnt spot anything obvious. Are the post cat 02 sensors easy to replace?...is it likely to be the sensor? Or is this a case of fault finding 😞

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nige8021

As you have already checked the pins/sockets on the disconnect down by the thermostat housing, as that is a common area for corrosion on the pins, then that only leaves the sensor itself,  it is reasonably easy to replace but before you do, soak the joint in plus-gas (not WD40) a couple of times then make sure the spanner is a good fit or you can buy a special 1/2" drive socket with the side cutout to allow the cable passed, then it's a case of unclipping the wiring back to the connector and refitting the new one, you can put some ant-sieze compound on the sensor threads, just make sure none gets onto the sensor head itself. 

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