Upstream Downstream Oxygen O2 Sensor 234-4076 234-4078 Compatible with Jeep for Cherokee for Grand Cherokee for TJ for Wrangler Item Description About this item Replacement for 234-4076 234-4078, fit for Dodge for Dakota V8 5.9L 1998-1999, fit for Jeep for Cherokee L6 4.0L 1996-1999, for Grand Cherokee L6 4.0L 1996-1999, for TJ 1997-1999, for Wrangler 1997-1999 Bank 1 Sensor 1 means Upstream/Right; Bank 2 Sensor 1 means Upstream/Left?Bank 1 Sensor 2 means Downstream/Right; Bank 2 Sensor 2 means Downstream/Left. The part of heating head of plugs are well designed to replace for your needing, no extra work required to reset or adjust when you use it, plug and play The part of wire is 4, this design to provide the double protection, and the wire is very firm. Please check the description or use the year/make/model drop down bar and interchangeable part numbers to confirm the compatibility. How to Install: Step1. Locate the oxygen sensor position and remove it with socket, step2. Compare the new sensor to the old sensor to ensure a proper installation, step3. Please clean the threaded port to en sure a proper seal of the new sensor,step4.Gently tighten the sensor in order to keep wire free from damage and avoid sensor leakage, step 5,reinstail the connecor,try to clear it if the car has diagnostic trouble codes. ? See more product details Payment We accept payment only through PAYPAL Shipping We ship products worldwide through standard express courier service, it will reach within 7 to 10 days to abroad buyers, we ship the product after recieved clear payment and give full information about shipment to the buyer Return We accept product return 25 days from delivery date but product should be in original condition.