OBD2 Readiness codes won't reset on 993
 

Hello.

I have a 1997 Porsche 993 normally aspirated car that doesn't want to reset any of the readiness codes. It shows two persistent heater errors for a flap and a sensor but thats all that is on the computer. No DME faults. I took it to the dealer and they did the short tests for secondary air and evap and both work fine

I also drove it about 100 miles and did the recommended drive procedures for idle and rpm control several times.

Any ideas and has anyone see this problem before. I had to disconnect the battery when doing a bunch of service, but didn't think to check for readiness prior to disconnecting. I cleaned out the secondary air injection system and put in new parts since the engine was out. All ports flow nicely. I replaced all the vacuum lines as well along with distributor belt, plugs, wires, clutch, chain tensioner housing gaskets etc. Car runs great and better than before.

Any advice or ideas appreciated. I will probably also post on Rennlist.

Thank you.

See post # 4 on this thread:

http://forums.pelicanparts.com/porsche-964-993-technical-forum/382813-obdii-readiness-drive-cycle-procedures.html

Sometimes you have to do this drive cycle more than once. It can be difficult to find a route that will allow you to complete this cycle properly.

Having to deal with SAI B.S. every year was a major factor in why I sold my 993 and went back to a 3.2 Carrera.

What infuriates me about OBDII is that many of the DTC codes have NOTHING to do with improving air quality. The pre-1996 "probe in the tailpipe" method should be a backup method for passing emissions but the politicians/EPA beauracrats won't have any of that.

Good luck, hope this helps!