Possible Causes of a P1133 on this vehicle (verbatum from ALLDATA):

An intermittent connection or corrosion in the O2S-1 harness connector can
set this DTC. Use scan tool to monitor O2S-1 voltage with engine running at
normal operating temperature while wiggling the signal and ground. Make sure
the sensor is tight.
The most probable cause for DTC P1133 is contamination. Check for obvious
contamitation (oil, fuel or engine coolant) by removing sensor. Identify and
correct the cause of the contamination if contaminated. Replace the O2S-1.

"Edward Crismond" > wrote in message
...
> Hi, this is also posted to rec.autos.makers.saturn
>
> I have a 2000 Saturn SL with a high idle problem and a constantly lit
> 'check engine light'. It only does the high idle intermitantly, when the
> engine is warmed up. Sitting at a stop light, while in neutral, the RPM
> may shoot up to 2000+. It will idle correctly, at around 800 RPM or so,
> after shutting the engine off, then restarting it.
>
> Since the 'check engine soon' light is on, I took it to Advance
> Auto and had them do an OBDII scan on the PCM. The code returned was:
>
> P1133
> Manfacurer Contrl.
> Fuel Air Metering
>
> (those are not typos, that's what it spit out)
>
> My Haynes manual doesn't say anything about P1133, but a Google
> search for P1133 comes up with:
>
> P1133 HO2S Insufficient Switching Bank 1 Sensor 1
>
> This short message thread, http://tinyurl.com/5zps9 talks about the sensor
> and some of the conditions that may cause P1133 to be set.
>
> Thanks in advance
> Ed