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Re: Failed Emissions
My MY-2000 W-car manuals state that the P1133 is a HO2S Insufficient Switching Sensor 1. In other words the PCM is looking at the Heated O2 sensor to see if it is switching/toggling. In 100 seconds if less than 40 rich/lean cycles are counted, the code sets.
My manuals also state that P1441 is Evap System Flow During Non-Purge. The vent valve also monitors tank pressure, it thinks the fuel tank pressure is less than -11 inches of water column. An easy problem is that the purge and vacuum lines are switched at the cannister purge valve. Other possibilities are the purge valve is stuck open or the circuit is grounded.
Other than the purge problem it sounds like the post-cat O2 sensor is bad or disconnected...if not the catalyst isn't doing jack. I'd fix that problem first, reset the codes and see what comes back. It is also possible that the pre-cat O2 sensor is bad....or the EVAP vacuum leak is holding the signal low too.
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1988 Chevy R-30 1 ton DRW pickup (217k)
1991 Chevy S-10 4WD pickup (192k)
2000 Grand Prix GTP (218k)
2002 GMC Yukon (185k)
2009 G8 - GT (46k)
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