Honda air-fuel ratio sensor 36531-PNA-315 upstream pre-oxygen easy replacement upgrade.

Honda Accord, CR-V, Civic 2.0L/2.4L O2 sensor, OEM 36531-PNA-315; directly replaces 36531-PNA-003, 36531-PLE-003 or 1924001043; universal to upstream oxygen sensor position. Core function: monitor exhaust oxygen and feed ECU to control fuel injection, improving combustion efficiency. If idle is unstable, fuel economy poor, acceleration weak, engine warning light on, strong exhaust odors, or cold-start difficulty, sensor signal is abnormal and should be replaced.