AP Exhaust 531126 Direct-Fit Replacement Oxygen Sensor

The AP Exhaust 531126 is a direct-fit replacement oxygen sensor (O2 sensor) designed to restore proper exhaust monitoring and engine management function. Built to meet or exceed OEM specifications, this sensor integrates seamlessly with the vehicle's engine control unit (ECU) to maintain optimal air/fuel mixture and emissions compliance.

Oxygen sensors measure the concentration of unburned oxygen in the exhaust stream and relay that data to the ECU, which continuously adjusts fuel delivery for efficient combustion. A failed or degraded O2 sensor can trigger a check engine light, reduce fuel economy, and cause the vehicle to fail an emissions inspection.

Key Features:

• Direct-fit replacement — no cutting or splicing required
• Built to OEM specifications for accurate signal response
• Designed for reliable performance in upstream or downstream exhaust positions (verify application)
• Manufactured by AP Exhaust Technologies, a trusted name in exhaust and emissions components since 1927
• Helps restore fuel efficiency, reduce emissions, and clear related diagnostic trouble codes (DTCs)

Always verify fitment using the application guide before installation. Check applications to confirm this part is correct for your specific year, make, model, and engine.