BDFHYK Oxygen Sensor Downstream O2, Compatible with Geo Prizm, Compatible with Toyota Avalon, Corolla, Paseo, Tercel, 234-4061, 2344625, 8946502030, Replacement 1PCS

This BDFHYK 234-4061 downstream O2 sensor is an OE-style aftermarket replacement for verified Geo Prizm and Toyota Avalon, Corolla, Paseo and Tercel applications. Fitment spans specific 1.5L, 1.6L, 1.8L and 3.0L engine combinations, so year and engine must be matched before ordering. Compare the original sensor number, downstream exhaust location, connector, wiring, lead length and emissions configuration. A Check Engine Light or stored OBD-II code alone does not prove downstream oxygen sensor failure.

234-4061 Downstream O2 Sensor Fitment for Toyota and Geo

234-4061 O2 Sensor Interchange References

Replacement references include 234-4061, 2344625, 8946502030, 8946507010, 8946507040, 8946512390, 8946512510, 8946516060, 8946516120, 8946541010, 8946541030 and 94849057.

234-4061 Downstream Sensor Position Check

This SKU is listed for downstream use. Do not assume one universal Bank/Sensor number across all applications; confirm the exhaust location from vehicle-specific service information.

234-4061 O2 Sensor Diagnosis Before Replacement

Inspect the connector, wiring, heater circuit, related fuse, exhaust leaks, fuel-control faults, misfires and catalyst condition before replacement. P0420 or P0430 does not automatically identify a failed downstream sensor.

234-4061 O2 Sensor Installation Notes

• Allow the exhaust system to cool before service.
• Use an O2 sensor socket or suitable wrench.
• Compare the connector, lead length and original reference before installation.
• 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 away from heat and moving parts.

234-4061 O2 Sensor Package Contents

• 1 × BDFHYK oxygen sensor

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