Ford Front Oxygen Sensor BL3Z-9F472-A Replaces 234-5038 Upstream

When your Ford vehicle’s check engine light is on, fuel consumption rises, acceleration is weak, or idle is unstable, the front oxygen sensor aging/failure is likely causing the air–fuel ratio imbalance. This sensor monitors exhaust oxygen and feeds the ECU to accurately control fuel injection, ensuring efficient combustion and reduced emissions. This product is an upstream dedicated oxygen sensor, OEM number BL3Z-9F472; can replace 234-5038, BL3A-9Y460-CA, CA38-18-8G1; fits multiple Ford models. Installation requires a dedicated socket to avoid damaging sensor threads; ensure connector is firmly plugged in and clear of looseness; after installation, clear fault codes and test drive.