986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - CHIP? 02 sensor issues. Anyone ever ran across this?

Tool Pants · 02-01-2008, 07:05 AM

You need the sensor before the cat. The sensor after the cat is because of the EPA. By having a sensor before AND after the cat the cat efficiency can be determined, thanks to the EPA. This is why ROW 986s do not have as many sensors as US/Canada cars.

There are oxygen sensor simulators you can buy.

The other thing you might try is to leave the sensor after the cat still connected to the electrical connector, but the sensor is not screwed into the exhaust as you do not have a bung, and just leave the sensor hanging in air.

I tried this on my 2.5. I did get fault codes when I checked with a PST2, but the check engine light did not come on.

02-01-2008, 07:05 AM	#6
Tool Pants Registered User Join Date: May 2002 Location: San Jose Posts: 1,889	You need the sensor before the cat. The sensor after the cat is because of the EPA. By having a sensor before AND after the cat the cat efficiency can be determined, thanks to the EPA. This is why ROW 986s do not have as many sensors as US/Canada cars. There are oxygen sensor simulators you can buy. The other thing you might try is to leave the sensor after the cat still connected to the electrical connector, but the sensor is not screwed into the exhaust as you do not have a bung, and just leave the sensor hanging in air. I tried this on my 2.5. I did get fault codes when I checked with a PST2, but the check engine light did not come on. Last edited by Tool Pants; 02-01-2008 at 02:48 PM.