More 1.6 FSI Woes

K

ksimpson

Member
Hi,

Just a few months after replacing the inlet manifold and several other bits, the CE light is back on. I'm getting the following code:

17863 - Exhaust Gas Temp Sensor 1 (G235): Implausible Signal
P1455 - 35-00 - -
17412 - Torque Difference Cylinder 1: Limit Value Exceeded
P1004 - 35-00 - -

I did a search and didn't find much. I remember shortly after we got the car, the light came on. The Audi dealer said it was a compression problem on one of the cylinders most likely caused by carbon build up. I stuck in a few bottles of Wynn's and it didn't trouble us until now (that's assuming it was the same problem). I think 17412 is a compression problem.

I've put in some engine treatment, but would appreciate if anyone has additional insights.

The 1.6 FSI is a cracking little engine when it's running well. However, our experience is that it's very temperamental.

Thanks,
 
I've decided to replace the Exhaust Gas Temperature Sensor to see if that solves the issue. Has anyone replaced one of these in the past? I believe it's situated just under the manifold, but wondering if it's easier to access from above or underneath the car.

Thanks,
 
ksimpson said:
The 1.6 FSI is a cracking little engine when it's running well. However, our experience is that it's very temperamental.
Click to expand...

You're not the only one to come to this conclusion.

I'm afraid I know next to nothing about the FSI, but as I see your original post went unanswered, I hope someone with greater knowledge could lend a hand here...

Best of luck,

Tom
 
Hi I'm not quite sure where the sensor is located - could it be one of the two exhaust lambda probes - NOX sensor? If so both located in the first section of exhaust with the wiring running through the black plastic trunking on the floor to the ecu.
As for the other code it sounds like number one cylinder is not pulling its weight either by lack of compression or possibly failing injector. I would advice using the sea foam product into the air intake system just to clear and crud from the back of the inlet valves. Sea foam is available on eBay with easy instructions and guidelines -- just remember fuel additive cleaner will not clean valves due to our engines being direct injection.
Hope that helps. Mike
 
Thanks guys. The sensor was handy enough. It's easy to access from under the car which took about an hour in total to change. That included removing the replacing the poxy under tray which is 90% held in place with cable ties at this stage.

However, when I went to clear the code with VCDS, a new one has appeared:

1 Fault Found:
17436 - Intake Manifold Tuning Valve Control Circuit: Open Circuit
P1028 - 35-00 - -

The Exhaust Gas Sensor one is gone and this one has taken it's place and is keeping the light on. I spent over €1,400 doing the intake manifold last year and I hope this isn't related. TBH, it would be debatable if the car is worth another outlay of that size.

Not happy.
 
Hi my opinion is an open circuit points to wiring damaged or the sensor itself has failed. The mechanism itself is non electrical, vacuum operated. The "pot" is located on the left hand end of the intake assembly-but be careful of the plastic operating lever! good luck mike
 
Cheers Mike, it was the vacuum actuated mechanism that failed the last time or at least its connection to the intake manifold which required the whole lot to be replaced.

I'll take a look at the wiring tomorrow and see if I see anything obvious.
 
Hi Mike,

You were correct. After a bit of a search, I found a broken wire to the connector for the potentiometer. There wasn't much to play with and it was awkward to get at, but I put a bit of solder on it and wrapped it in insulation tape. I hooked up VCDS and the light went out and has stayed out after a 10 min test drive. Hopefully that's that one sorted. I now have a 1.6 FSI with the CEL out and no error codes.
 
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Thats good news--i have had experience of this on another fsi, i feel its where the wire has been stressed on removal of the inlet tract. happy motoring mike
 
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