[Don Plumley]

Hi,

On my 993 I have OBD Codes P1117 and P1121: O2 sensor heating not working after the cat on both banks. These sensors were disconnected for cat bypass pipes and hung open under the engine. They were fairly black, unlike the sensors in the cat pipes that were grey.

I've reinstalled the cat and reinstalled the sensors. Atfter 23 miles the CEL comes on. I've reset it twice, and today I read the codes. Could it be that by being in the open for so long, the sensors are broken? Is there anything else I should look at?

Thanks, and Happy Porsche New Year!

Don

(I posted this on Rennlist, but more Pelicans seem to be online now)