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need help diagnosing cat conv codes


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2004 986S

20,500 miles, about 15K on the track

Driver's side catalytic convertor was replaced many thousands of track miles ago

Passenger side cat is still original

Talking about the cats integrated into the headers here - and the '04 has a sensor in the front and on the rear of these integrated cats - no sensors in the secondary cats

I got:

P0420

Porsche fault code 40

catalytic convertor efficiency bank 1

  • Oxygen sensor ahead of and after TWC exchanged
  • Valve lift fault
  • Aged oxygen sensor after TWC
  • TWC faulty

and I got:

P0430

Porsche fault code 45

catalytic onvertor efficiency bank 2

  • Oxygen sensor ahead of and after TWC exchanged
  • Valve lift fault
  • Aged oxygen sensor after TWC
  • TWC faulty

I put my stethoscope against both cats. The sounds coming from both are engine sounds...the sound on the passenger side seems a little deeper, but I don't hear anything I would immediately call "rattling around" sounds.

In bank 1, the 02 sensor resistance ahead of the cat is 128 Ohms, and the resistance in the sensor after the cat is 64 Ohms.

In bank 2, the resistance on both sensors is 64 Ohms.

A chart for voltage for bank 1 and for bank 2 can be seen here (click on the image to make it bigger - and sorry, I still haven't figured out how to upload an image):

http://user.streetfire.net/album/voltage-f...nks_1650087.htm

Anyone know what is going on here?

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2004 986S

20,500 miles, about 15K on the track

Driver's side catalytic convertor was replaced many thousands of track miles ago

Passenger side cat is still original

Talking about the cats integrated into the headers here - and the '04 has a sensor in the front and on the rear of these integrated cats - no sensors in the secondary cats

I got:

P0420

Porsche fault code 40

catalytic convertor efficiency bank 1

  • Oxygen sensor ahead of and after TWC exchanged
  • Valve lift fault
  • Aged oxygen sensor after TWC
  • TWC faulty

and I got:

P0430

Porsche fault code 45

catalytic onvertor efficiency bank 2

  • Oxygen sensor ahead of and after TWC exchanged
  • Valve lift fault
  • Aged oxygen sensor after TWC
  • TWC faulty

I put my stethoscope against both cats. The sounds coming from both are engine sounds...the sound on the passenger side seems a little deeper, but I don't hear anything I would immediately call "rattling around" sounds.

In bank 1, the 02 sensor resistance ahead of the cat is 128 Ohms, and the resistance in the sensor after the cat is 64 Ohms.

In bank 2, the resistance on both sensors is 64 Ohms.

A chart for voltage for bank 1 and for bank 2 can be seen here (click on the image to make it bigger - and sorry, I still haven't figured out how to upload an image):

http://user.streetfire.net/album/voltage-f...nks_1650087.htm

Anyone know what is going on here?

I took the passenger side header off - the honey comb is loose and sliding fore and aft. So, guess I need a new header on

that side.

Anyone want to diagnose the drivers side before I take it off?? I find it puzzling I got a fault code on both sides...

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2004 986S

20,500 miles, about 15K on the track

Driver's side catalytic convertor was replaced many thousands of track miles ago

Passenger side cat is still original

Talking about the cats integrated into the headers here - and the '04 has a sensor in the front and on the rear of these integrated cats - no sensors in the secondary cats

I got:

P0420

Porsche fault code 40

catalytic convertor efficiency bank 1

  • Oxygen sensor ahead of and after TWC exchanged
  • Valve lift fault
  • Aged oxygen sensor after TWC
  • TWC faulty

and I got:

P0430

Porsche fault code 45

catalytic onvertor efficiency bank 2

  • Oxygen sensor ahead of and after TWC exchanged
  • Valve lift fault
  • Aged oxygen sensor after TWC
  • TWC faulty

I put my stethoscope against both cats. The sounds coming from both are engine sounds...the sound on the passenger side seems a little deeper, but I don't hear anything I would immediately call "rattling around" sounds.

In bank 1, the 02 sensor resistance ahead of the cat is 128 Ohms, and the resistance in the sensor after the cat is 64 Ohms.

In bank 2, the resistance on both sensors is 64 Ohms.

A chart for voltage for bank 1 and for bank 2 can be seen here (click on the image to make it bigger - and sorry, I still haven't figured out how to upload an image):

http://user.streetfire.net/album/voltage-f...nks_1650087.htm

Anyone know what is going on here?

I took the passenger side header off - the honey comb is loose and sliding fore and aft. So, guess I need a new header on

that side.

Anyone want to diagnose the drivers side before I take it off?? I find it puzzling I got a fault code on both sides...

I just took the driver's side off. It moves fore and aft too, not as easily as the passenger side, but it does move if you tap the header or shake it hard.

Before I order two new headers, I'm hoping somebody can tell me if fore and aft movement (I cannot see any broken peices or cracks in the honeycomb matrix) means a dead cat.

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