Upstream and Downstream 2pcs Oxygen O2 Sensor 1 and Sensor 2, 234-4076, 234-4078 Replacement For 97 98 99Jeep Cherokee Grand Cherokee Wrangler 4.0L COMPATIBLE WITH OEM NUMBERS:234-4078 or SG1815; 234-4076 Guaranteed Direct Fit For Easy Installation and Great Performance at a Low Price Prevents premature sensor failure and long warranty This is Brand New & High Quality Aftermarket Product service. Meet the professtional specification as OEM parts, for stable performance & durable