I'm Baffled - SOLVED!

[adiohead]

ok, at high speed/temp/revs my car got this:

17863 - Exhaust Gas Temp Sensor 1 (G235): Implausible Signal

P1455 - 35-10 - - - Intermittent
17864 - Exhaust Gas Temp Regulation for Bank 1: Limit Reached

P1456 - 35-10 - - - Intermittent
16684 - Random/Multiple Cylinder Misfire Detected

P0300 - 35-00 - -
16685 - Cylinder 1 Misfire Detected

P0301 - 35-00 - -
16688 - Cylinder 4 Misfire Detected

P0304 - 35-00 - -



I had the EGT sensor changed last year because of the same fault, so unless the new one has failed it must be something else causing this. The ignition coils are all the new type and were changed because the old ones failed.



I decided to unplug the EGT to see if it still did it and although it isn't fuel dumping it is still pulling back at high speed/revs/temp.


With the EGT unplugged I got this:

16497 - Intake Air Temp. Sensor (G42): Signal too High
P0113 - 35-00 - -
17863 - Exhaust Gas Temp Sensor 1 (G235): Implausible Signal
P1455 - 35-10 - - - Intermittent



I plugged it back in and now this code won't go away:

17861 - Exhaust Gas Temp Sensor 1 (G235): Open or Short to Plus
P1453 - 35-00 - -


what is it???
Is it just a faulty EGT, or is the TIP collapsing (car is standard 225), or is the MAF gone???

it's weird. The fact it's still misbehaving with the EGT unplugged gives me hope that it isn't faulty.

 

[adiohead]

desperate bump

 

[BeartheBruce]

At a guess, owing to the intermittent nature and the fact that once unplugged and re-plugged the code stayed, I'd be looking for a bad connection to the sensor or a broken/chaffed wire from the sensor to the ECU.

 

[adiohead]

Thank you for the reply Bruce

I got my garage to check all the wiring and they can't find anything wrong.

They're suspecting is something either airflow related or just faulty coils (even though I replaced them for the new type), OR that the car might need a software update, but I'm unsure if SEAT ever did any.

I've suspected the TIP could be collapsing but the car is running the standard map.


It's all still a mystery

 

[adiohead]

New Autobahn88 silicone TIP seems to have solved the problem!

YAY!