BDFHYK Oxygen Sensor Downstream O2, Compatible with Ford C-Max Escape Fusion Police Responder Hybrid l4 2.0L 2.5L, Compatible with Lincoln MKZ, 18138, CJ5Z9G444B Replacement 1PCS

This BDFHYK 18138 downstream O2 sensor is an OE-style aftermarket replacement for listed Ford C-Max, Escape, Fusion, Police Responder Hybrid and Lincoln MKZ applications that cross-reference CJ5Z9G444B. The product application includes 2.0L and 2.5L four-cylinder configurations, but engine fitment must be matched to the exact vehicle. Before ordering, verify year, engine, original sensor number, downstream exhaust location, connector, wiring, lead length and emissions configuration. A stored code alone does not prove sensor failure.

18138 Downstream O2 Sensor Fitment for Ford and Lincoln

• Ford C-Max
• Ford Escape
• Ford Fusion
• Ford Police Responder Hybrid
• Lincoln MKZ

Confirm the exact year and engine before ordering. Do not assume every 2.0L or 2.5L version uses the same downstream sensor.

18138 O2 Sensor Interchange References

Replacement references include 18138 and CJ5Z9G444B. Match the reference together with the connector, harness and downstream location.

18138 Downstream Sensor Position Check

This SKU is listed for downstream use. Do not convert “downstream” into one universal Bank/Sensor label; bank and sensor numbering depends on the vehicle and exhaust layout.

18138 O2 Sensor Diagnosis Before Replacement

Inspect wiring, connector condition, heater power and ground, the related fuse, exhaust leaks, fuel-control faults, misfires and catalyst operation before replacement. P0420 or P0430 does not automatically prove a downstream oxygen sensor is defective.

18138 O2 Sensor Installation Notes

• Allow the exhaust system to cool before service.
• Use an O2 sensor socket or suitable wrench.
• Compare the connector and lead length with the removed sensor.
• Inspect bung threads and start the sensor by hand.
• Use anti-seize only when permitted by the sensor instructions.
• Tighten to the applicable service specification and route the harness safely.

18138 O2 Sensor Package Contents

• 1 × BDFHYK oxygen sensor

Important: This is an OE-style aftermarket replacement, not a factory-branded part.