OT GM trouble code P 1133

It's been awhile since I've seen your posts. Hope it's because I am not on very often. Hope all is well with you and your family. I've been here in Abilene now fro about eight months from Kunsan. Momma-San still lives in Clovis NM and won't move so I still try to make frequent trips back there. Started doing undershirt duty, so I don't think my trips will be as frequent. Take care, and good luck with the car.

Jim Without Weapons...There Is No Force, Just U.S. Air

From the GM service manual:

DTC P1133 is most likely caused by one of the following:

Fuel pressure--The system will go rich if fuel pressure is to high. The PCM can compensate for some increase, however, if it gets too high, a DTC P0172 will be set. Refer to Fuel System Diagnosis 2.4L, Fuel System Diagnosis 2.2L. Leaking injector--A leaking or malfunctioning injector can cause the system to go rich. MAP sensor--An output that causes the PCM to sense a higher than normal manifold pressure (low vacuum) can cause the system to go rich. Disconnecting the MAP sensor will allow the PCM to set a fixed value for the MAP sensor. Substitute a different MAP sensor if the rich condition is gone while the sensor is disconnected. Pressure regulator--Check for a leaking fuel pressure regulator diaphragm by checking for the presence of liquid fuel in the vacuum line to the regulator. TP sensor--An intermittent TP sensor output will cause the system to go rich due to a false indication of the engine accelerating. O2S 1 contamination--Inspect O2S 1 for silicone contamination from fuel or use of improper RTV sealant. The sensor may have a white powdery coating and result in a high but false voltage signal (rich exhaust indication). The PCM will then reduce the amount of fuel delivered to the engine causing a severe surge or driveability problem.

try simple stuff first, unplug/replug the O2 sensor, new air cleaner, might be time for new plugs, sometimes you find your problem during your inspection, I found mouse had eaten the air cleaner and filter dust on stuff was throwing stuff out of whack, code was O2 sensor

if car is 98, new O2 sensor might help gas mileage even if thats not your problem

I was told that the front sensor usually goes, runs a lot hotter

you can actually test the sensor with decent voltmeter and torch, redneck way is to hook voltmeter to the sensor leads and drive around with somebody hanging inside the hood watching the meter, burn the tires to liven things up a bit

I found the specifics on-line but can't remember exactly where

(HO2S = Heated O2 Sensor)

Sounds like O2 Sensor #1 has gotten "lazy".

If this is a 4-cylinder, the #1 sensor would be the sensor ahead of the "CAT". If a V-6 and has 2 sesors ahead of the CAT, I'm not sure which sensor would be called #1.