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New fault codes found. Any ideas what they are please?


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Just got a new fault code in the 996 TT. Durametric reads it as P0420, fault code 40, cat converter efficiency bank 1 and P0430, fault code 45, cat converter efficiency bank 2. Any idea if this is very serious and if car needs to be towed or can codes be erased and car driven to workshop. Thanks in advance. For information, the car is running fabspeed exhaust and cats.

Edited by Harold 348
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P0420 40 TWC conversion, bank 1 - above limit

Possible fault causes:

- Oxygen sensor ahead of and after TWC exchanged

- Valve lift fault

- Aged oxygen sensor after TWC

- TWC faulty

If the light is on steady it can be driven -- if the light is flashing do not drive the car.

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P0420 40 TWC conversion, bank 1 - above limit

Possible fault causes:

- Oxygen sensor ahead of and after TWC exchanged

- Valve lift fault

- Aged oxygen sensor after TWC

- TWC faulty

If the light is on steady it can be driven -- if the light is flashing do not drive the car.

Much thanks Loren.

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  • 8 months later...

Anyone have an idea what CEL code 0134 is? CEL came on after trying to follow my buddy in his Aston martin Vantage (C4 had no problem keeping up) CEL popped up after hard left turn. Light reset after a few restarts and 80 miles.

thanks!

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P0134 Oxygen Sensor Ahead of Catalytic Converter (Cylinders 1 - 3) - Interruption of Signal

Open circuit in signal wire or ground wire of one oxygen sensor.

Oxygen sensor heating not functioning.

Output stage of DME control module faulty.

Open circuit to common sensor ground.

- Wiring harness

- Oxygen sensor

- DME control module

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