BDFHYK Oxygen Sensor Upstream Downstream O2 Sensor, Compatible with Jeep Cherokee Grand Cherokee Wrangler 4.0L 1996 1999, Dodge Dakota 5.9L 1998-1999, 234-4076 234-4078 Replacement 2PCS

This BDFHYK 234-4076 / 234-4078 O2 sensor set includes two OE-style aftermarket replacement sensors for listed 1996-1999 Jeep Cherokee, Grand Cherokee and Wrangler 4.0L L6 applications plus 1998-1999 Dodge Dakota 5.9L V8 applications. The set is intended to cover upstream and downstream service needs where the listed application requires these references. Before ordering, confirm both original sensor numbers, exact exhaust locations, connectors, wiring, lead lengths and emissions configuration. Do not assume the two sensors are interchangeable by position.

234-4076 234-4078 O2 Sensor Set Fitment for Jeep and Dodge

234-4076 234-4078 O2 Sensor Interchange References

The set is identified by 234-4076 and 234-4078. Additional listed references associated with this product family include 4606421, 4606620, 4686222, 5269744, 56027916, 56028603, 56041111, 56041212, 56041212AE, M05269744, 250-24076 and 350-34018. Match each removed sensor separately before installation.

234-4076 234-4078 Upstream and Downstream Position Check

This is a two-sensor set for upstream and downstream service on listed applications. Exact Bank/Sensor placement must be confirmed for the vehicle; do not swap positions solely because the sensors appear similar.

234-4076 234-4078 O2 Sensor Diagnosis Before Replacement

Inspect both connectors, wiring, heater circuits, related fuses, exhaust leaks, intake or vacuum leaks, fuel-control faults, misfires and catalyst condition before replacement. A diagnostic code at one sensor location does not automatically mean both sensors require replacement.

234-4076 234-4078 O2 Sensor Installation Notes

• Allow the exhaust system to cool before service.
• Identify and label each original sensor position before removal.
• Compare each replacement connector, lead length and reference with the corresponding removed sensor.
• Inspect bung threads and start sensors by hand.
• Use anti-seize only when permitted by the sensor instructions.
• Tighten to vehicle-specific specifications and route each harness away from heat and moving parts.

234-4076 234-4078 O2 Sensor Set Package Contents

• 2 × BDFHYK oxygen sensors

Important: These are OE-style aftermarket replacements, not factory-branded parts.