Dashboard warning lights on and Faulty codes

VW Caddy 2008 1.9TDI

Recently got warning lights on and loss of power one week after serice.
Attachment 13056 always on
Attachment 13057 blinking.

Faulty codes: P161B, P161C and P0546.

I replaced 2#,3# glow plugs then P161B and P161C codes gone.

Now another faulty code is coming out. It's P2002. DPF might be blocked.
Attachment 13058

Today I tried to find out the faulty egt sensor.
Attachment 13059Attachment 13060I guess these are the three egt sensors(brown,black and yellow).

Attachment 13061I took this photo on the top of dpf forward from driver postion . The middle one is Oxygen sensor. The left one is egt sensor (brown). The right one is not egt sensor. It's pressure sensor.
The other two egt sensors are going deep inside. I can't locate them.

Could anyone give me any idea which egt sensor is faulty according to faulty code P0546? how to find out the part number? Thanks.

firstly check the engine oil level, if this is too high it will cause the engine and dpf light to come on....be sure the correct oil has been used vw504 and 507 approval .Overfull oil is a possible reason and a easy one to check particularly just after a service.

Its usually the one with the brown plug that fails......VDUB..

Quote:

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Originally Posted by volksMuller

be sure the correct oil has been used vw504 and 507 approval .

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I thought only 507 is approved for engines with a DPF.

Quote:

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Originally Posted by jets

I thought only 507 is approved for engines with a DPF.

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This is correct

Thanks for all replies. Checked engine oil level. A littel bit high.
I unplugged one sensor at a time and scaned faulty codes. Figured out it's the black one.
Attachment 13070 the brown sensor

Attachment 13071 the yellow sensor

Attachment 13072 the black sensor

When I finished testing and plugged all sensors, something strange happen. All faulty codes were gone.
Attachment 13073only this warning light is on. No faulty codes.

all vw504 and 507 oils are 5w30. would 5w40 be better?

It's my understanding that thinner oils carry heat away more efficiently. (?)

Quote:

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Originally Posted by snake

Thanks for all replies. Checked engine oil level. A littel bit high.
I unplugged one sensor at a time and scaned faulty codes. Figured out it's the black one.
Attachment 13070 the brown sensor

Attachment 13071 the yellow sensor

Attachment 13072 the black sensor

When I finished testing and plugged all sensors, something strange happen. All faulty codes were gone.
Attachment 13073only this warning light is on. No faulty codes.

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That little light is the DPF regen light
If it doesn't go out after 10-15mins of keeping the engine speed above about 2000rpm (highway driving) you'll need a manual regen....... but you probably already knew this.

You can't buy a 504 oil or a 507 oil, only 504/507.

As far as I know, all 504/507-approved oils are 5W30.

Quote:

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Originally Posted by jets

I thought only 507 is approved for engines with a DPF.

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504 is the petrol spec. I haven't seen a 507 yet that isn't 504 & viceversa. So you look for one & see the other

It's also easy to forget 'voltage' which can be an issue on 'e' cars causing weird pop ups. Voltage can be the forgotten factor in some cases.
How old is the battery?