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CEL came on, so I hooked up my Durametric reader and received the codes P1275 & P1276. I’m assuming that aging sensors need to be replaced. I didn’t realize O2 sensor were wear items. My question is do I need to replace all of them or just the two behind the cats. I have a MY99 996 C2 6 speed.

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CEL came on, so I hooked up my Durametric reader and received the codes P1275 & P1276. I’m assuming that aging sensors need to be replaced. I didn’t realize O2 sensor were wear items. My question is do I need to replace all of them or just the two behind the cats. I have a MY99 996 C2 6 speed.

Lee:

If you have to get the 02 sensors, don't spend the extra money for the "Porsche" part with the Porsche Part number. Get the equivalent Bosch part. Same part, but no Porsche box or part number stamped on it.

Porsche does not manufacture 02 sensors, Bosch does. The Bosch part is exactly the same, and has the correct connector.

The O2 sensors do age, and replacement is generally recommended between 60 and 100K miles.

Take a look at Mike Focke's Boxster Pages for a good overview of O2 Sensors, at the following link:

http://mike.focke.googlepages.com/oxygensensors

Regards, Maurice.

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P1275 Aging of Oxygen Sensor Ahead of Catalytic Converter (Cylinders 1 - 3) - Below Lower Limit

P1276 Aging of Oxygen Sensor Ahead of Catalytic Converter (Cylinders 4 . 6) - Below Lower Limit

Those sensors are Ahead of the cat.

If it were my car I would clear the CEL and see if they come back.

If they do then just replace the ones that have faults.

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Maurice and Loren,

Thanks for the information. I’ve cleared the CEL a few of times, before having a reader and the CEL would come back on. The latest time it came back on the very next day whereas before it took a few months and then a few weeks. I thought it was related to the K & N CAI because of all the reports of CEL associated with the mod.

Do either of you know the equivalent Bosch part number and an internet supplier?

Thanks again and have a great day.

Lee

:renntech:

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Maurice and Loren,

Thanks for the information. I’ve cleared the CEL a few of times, before having a reader and the CEL would come back on. The latest time it came back on the very next day whereas before it took a few months and then a few weeks. I thought it was related to the K & N CAI because of all the reports of CEL associated with the mod.

Do either of you know the equivalent Bosch part number and an internet supplier?

Thanks again and have a great day.

Lee

:renntech:

Lee:

For your MY99 996, the Bosch Part numbers are as follows:

13564 Oxygen Sensor - OE Type BEFORE Catalyst Two required

13723 Oxygen Sensor - OE Type AFTER Catalyst Two required

You can double check the part numbers on the Bosch Parts website at : http://www.boschautoparts.com

If you want to buy them locally (where you are), put your zip code in to the box supplied and they will give you a local retailer.

If you want to get them online, here are two sites:

http://www.oxygensensorwholesale.com (about $146 each, free shipping)

http://www.autohausaz.com (about $136 each, well known supplier).

You could also try board sponsor Sunset Imports, but I don't know if they supply the Bosch as opposed to the Porsche part.

Also, there seems to be an issue with getting the "universal type" which requires you to splice the connector from your old sensor onto the new universal one, because you apparently cannot solder it on, etc... Perhaps someone else here can explain that in more scientific detail. If you get the "OEM-type" sensors by Bosch, you will avoid those issues. The prices above are for the OEM type ones, which will just plug in.

I would replace the ones BEFORE the catalytic converters first, as Loren has pointed out.

Regards, Maurice.

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