Package Included:<br />2 x Oxygen Sensor (1 front + 1 rear)<br /><br />Features:<br />Direct Plug-In Replacement.<br />Use a 10-megaohm digital voltmeter. Hook up the voltmeter's red probe to the sensor's signal wire and the black probe to engine ground.<br />(Use back probe method｣ｬ DO NOT pierce the wire.)<br />For a good sensor｣ｬ voltage should fluctuate constantly between 0.1 and 0.9 volts after starting the engine for 2 or 3 minutes.<br /><br />Specification:<br />Interchange Part Number: 234-9001｣ｬ 234-4189<br />Direct Plug-In Replacement.<br />Length: 37.9CM 77.5CM<br />Compatible:2000-2004 Toyota Tacoma