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There are a short description deal with G235 and G236 exhaust gas temperature EGT senders problems. OEM name of the probe could be 06A 919 529 or 078 919 529. EGT senders are designed to protect turbochargers against thrermal shock and overheating.
Damaged EGT sensors set ECU in safe mode to prevent engine parts further destruction. In this "safe mode" turbocharged engine works almost like normally aspirated one.
ECU memory faults DTC's conectted with G235 or/and G236 are listed below:
| 17861 | P1453 | Exhaust gas temperature sensor 1 open/short to B+ |
| 17862 | P1454 | Exhaust gas temperature sensor 1 short to
ground |
| 17863 | P1455 | Exhaust gas temperature sensor 1 range/performance |
| 17864 | P1456 | Exhaust gas temperature control bank 1 limit attained |
| 17865 | P1457 | Exhaust gas temperature sensor 2 open/short to B+ |
| 17866 | P1458 | Exhaust gas temperature sensor 2 short to ground |
| 17867 | P1459 | Exhaust gas temperature sensor 2 range/performance |
| 17868 | P1460 | Exhaust gas temperature control bank 2 limit attained |
After my private investigation ;-) it turned out, that the main problem is not a thermocouple (as I supposed before) but electronic circuit. Because electronic is my hobby I decided to save some money and mend a sensors my self.
For now I will present only photos as a description of repairation process.
Disassembled OEM EGT Senders
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Manufacture date:
2001 on the left; 2008 on the right
Below PCB with
electronic circuit conversing thermocouple signal into engine ECU
standard
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PCB inside original EGT Sensor housing
(click on photo to englare)
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Here You can find more (polish)
Here repairation process manual (polish)