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1999 996 Post Cat O2 sensor Question

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I need to replace the O2 sensor on my 1999 996 TT. Two questions

1) Is there one or 2 post cat O2 sensors on the car? (are there two cats?)

2) any info on the replacement? I searched and can't seem to find any details. do I need to put it on a lift or can I get to it with jackstands. Any hints or tricks?

Thanks all. I appreciate the great feedback.

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My bad, I meant Carrera!! I don't know why I put tt in there, I think I was dreaming!!

The code is P0160

Porsche fault code 20 - O2 sensor behind CAT.conv.

Bank 2

And a p1121

I also had an MAF code and changed out the MAF but the two above came back.

I appreciate your help!!

Is that just one that needs replaced?

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Wishful thinking perhaps... ;)

P0160 Oxygen Sensor After Catalytic Converter (Cylinders 4 - 6) - Interruption of Signal

Possible causes:

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

Oxygen sensor heating not functioning.

DME control module output stage faulty.

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996 has two cats - one for each engine bank.

On each cat is two sensors - one before the cat and one after the cat.

Cylinders 4-6 are on the right side of the car. The cats cross in the rear before the muffler so it is best to follow the header on the right side to it's cat and then to sensor on the muffler side of the cat.

Without additional waveform diagnostics and tests you likely need to replace that sensor. I highly recommend Porsche or the (exact) equal from Bosch as many folks have had problems with after-market O2 sensors and connectors.

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