2RZ 2.4L 3RZ 2.7L Oxygen Sensor Upstream DENSO 1999-2004

Description

2RZ 2.4L 3RZ 2.7L Oxygen Sensor Upstream DENSO 1999-2004

Fits:

1999-2002 4Runner 3RZ 2.7L

2000-2004 Tacoma 2RZ 2.4L 3RZ 2.7L

DENSO’s light duty oxygen sensor started to appear on vehicles with the development of fuel injection systems. The basic job of the sensor is to monitor the air fuel mixture under idle, moderate acceleration and cruise conditions. Under heavy acceleration the oxygen sensor goes into “open loop,” which basically means that the engine management computer system ignores the oxygen sensor. Oxygen sensors have a smaller range of limits in detecting and adjusting the difference from an optimum air/fuel ratio.