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 MANUALSACURA2018MDX BASEREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALMECHANICALENGINE CONTROL AND ENGINE MECHANICAL - SERVICE, TESTING AND TROUBLESHOOTING (EXCEPT HYBRID)GENERAL INFORMATIONHOW TO SET READINESS CODESAIR FUEL RATIO (A/F) SENSOR HEATER MONITOR READINESS CODE

2018 Acura MDX Base

Air Fuel Ratio (A/F) Sensor Heater Monitor Readiness Code

2018 Acura MDX BaseSECTION Air Fuel Ratio (A/F) Sensor Heater Monitor Readiness Code

NOTE: All readiness codes are cleared when the battery is disconnected, if DTCs have been cleared, or if the PCM is reset with the HDS.

Procedure

1. Start the engine, and let it idle for 1 minute. The readiness code should switch from incomplete to complete.

2. If the readiness code is still not set to complete, check for a Pending DTC. If there is no DTC, repeat the procedure.

RENDER: 1.0x

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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.