Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - TESTS W/CODES - DTC P0100-P0134DTC P0133DTC P0133, P1133 OR P1134: O2S CIRCUIT-SLOW RESPONSE-SENSOR 1 (1.9L SATURN)NOTES
1999 GMC Forward Control 5.7 R, Automatic
DTC P0133, P1133 Or P1134: O2S Circuit-Slow Response-Sensor 1 (1.9L SATURN): Notes
1999 GMC Forward Control 5.7 R, AutomaticSECTION Notes
NOTE:
For circuit reference, see appropriate wiring diagram in WIRING DIAGRAMS article.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.