BDFHYK Oxygen Sensor Upstream O2, Compatible with Volkswagen Golf Jetta Passat, Compatible with Audi A8 Quattro Q7, 1736, 17140 Replacement 1PCS

This BDFHYK upstream O2 sensor is an OE-style aftermarket replacement for verified Volkswagen and Audi applications that cross-reference 17140, 1736, 17235, 17260, or 17262. Before ordering, match the original sensor number and confirm the exact exhaust position, connector shape, terminal arrangement, wiring, lead length, engine, and emissions configuration for the vehicle. A Check Engine Light or stored OBD-II code alone does not confirm oxygen sensor failure.

17140 Upstream O2 Sensor Fitment for Volkswagen and Audi

Engine and emissions configuration can change the required sensor within the same model year. Match the removed sensor and vehicle-specific service information before installation.

17140 O2 Sensor Interchange References

Replacement references include 17140, 1736, 17235, 17260, and 17262. An interchange-number match should be confirmed together with the vehicle application, connector, harness length, and sensor location.

17140 Upstream Sensor Position Check

This SKU is listed for an upstream oxygen-sensor application. Do not convert “upstream” into a universal Bank 1 Sensor 1 or Bank 2 Sensor 1 label. Bank and sensor numbering depends on the engine and exhaust layout.

17140 O2 Sensor Diagnosis Before Replacement

Inspect the sensor connector, wiring, heater circuit, related fuse, power and ground, exhaust leaks, intake or vacuum leaks, fuel pressure, injector operation, misfires, and other engine-control inputs before replacement. P0171, P0174, P0420, or P0430 should be diagnosed as system faults rather than treated as automatic proof that this sensor is defective.

17140 O2 Sensor Installation Notes

• Allow the exhaust system to cool before service.
• Use an O2 sensor socket or suitable wrench and disconnect the electrical connector without pulling on the wiring.
• Compare the connector and lead length with the removed sensor before installation.
• Inspect the exhaust bung threads and start the sensor by hand.
• Use anti-seize only when permitted by the sensor instructions.
• Tighten to the applicable vehicle service specification and route the harness away from heat and moving parts.

17140 O2 Sensor Package Contents

• 1 × BDFHYK oxygen sensor

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