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.
Overall Function Check
Use this procedure to check the overall function of the air fuel ratio (A/F) sensor 1 circuit. During this check, a DTC might not be confirmed.
With GST
- Start engine and warm it up to normal operating temperature.
- Drive the vehicle at a speed of 80 km/h (50 MPH) for a few minuts in the suitable gear postion.
- Set D position, then release the accelerator pedal fully until the vehicle speed decreases to 50 km/h (30 MPH).
- Repeat steps 2 to 3 five times.
- Stop the vehicle and turn ignition switch OFF.
- Wait at least 10 seconds and restart engine.
- Repeat steps 2 to 3 five times.
- Stop the vehicle and connect GST to the vehicle.
- Make sure that no DTC is displayed.
If the DTC is displayed, Go to DIAGNOSTIC PROCEDURE .
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.