Anyone had G235 EGT sensor fail?

**jazd** · 09-07-2012, 09:38 PM

I'm getting an intermittent fault on G235 (scanned with VCDS), the temp sensor before the turbo. Glow plug light comes up and the check engine/workshop message comes up.

VCDS is reading 1000/1024 degs. Fairly sure this is not the actual temperature but the sensor has failed. Weird though it only happens when I put my foot down, but you can see the other 2 temp sensors aren't going very high.

So yeah just wondering if anyone has replaced one before. The part number is 03L 906 088 BS and its listed at around $200 in ETKA. I wonder if any other part numbers are compatible.

**gldgti** · 09-07-2012, 10:16 PM

I would log the output during a drive to be sure. It should be smooth and vary between 150-200C at warm idle, and getto 3-400 C during normal driving whilst accelerating. During a hard pull I would not want to see it go over 850. If it was really reading 1000C, you would be in major trouble (melted pistons etc).

They are a resistance based sensor but I would think if it was going to fail it would go way out of range. Also, I'm not sure that it is, but I would expect it to be basically just a k-type thermocouple.

**h100vw** · 09-07-2012, 10:22 PM

Not logged one that high, even on a regen 900 is a lot.

**Transporter** · 09-07-2012, 10:24 PM

I replaced one last week in Scout TDI BMM engine. I'm sure it's the same sensor, it's quite common failure. Disconnect the sensor’s connector, connect a new sensor or 220ohm resistor and check the measuring block 067, it should be showing ambient temperature.

**PeDiES** · 09-07-2012, 10:24 PM

I've changed a few, fairly common issue

**buzuki** · 10-07-2012, 06:46 PM

i replace one today. On a caddy.

**Umai Naa!!** · 10-07-2012, 06:49 PM

I've put 3 in the same Caddy.

Not sure what the go was there.

I did read that you have to be gentle with the wiring, but I was certain that didn't atribute to subsequent failures.

**jazd** · 10-07-2012, 08:55 PM

Thanks guys, seems like it is very common. Hopefully I only have to replace mine once.

I have logged it and yeah it jumps up to 1000, I was basically just worried something had gone horribly wrong and it actually was getting that hot.

I hope its not a pain to get at.