Patriot 4WD L4-2.4L (2009)
Oxygen Sensor: Service and Repair
Removal
2.0, 2.4L AWD
DOWNSTREAM OXYGEN SENSOR (1/2)
WARNING: THE EXHAUST MANIFOLD, EXHAUST PIPES AND CATALYTIC CONVERTER(S) BECOME VERY HOT DURING
ENGINE OPERATION. ALLOW ENGINE TO COOL BEFORE REMOVING OXYGEN SENSOR. FAILURE TO ALLOW
ENGINE TO COOL BEFORE REMOVAL MAY RESULT IN PERSONAL INJURY CAUSED BY BURNS.
CAUTION: When disconnecting sensor electrical connector, do not pull directly on wires going into oxygen sensor. Damage to the oxygen
sensor may occur.
NOTE: Use an oxygen sensor (O2S) removal tool for this procedure.
1. Raise and support vehicle.
2. Disconnect O2S wire harness mounting clips from engine or body, if equipped.
3. Disconnect O2S pigtail harness connector (1) from engine wiring harness.
4. Remove O2S (3) from exhaust pipe (2).
UPSTREAM OXYGEN SENSOR (1/1)
WARNING: THE EXHAUST MANIFOLD, EXHAUST PIPES AND CATALYTIC CONVERTER(S) BECOME VERY HOT DURING
ENGINE OPERATION. ALLOW ENGINE TO COOL BEFORE REMOVING OXYGEN SENSOR. FAILURE TO ALLOW
ENGINE TO COOL BEFORE REMOVAL MAY RESULT IN PERSONAL INJURY CAUSED BY BURNS.
CAUTION: When disconnecting sensor electrical connector, do not pull directly on wires going into oxygen sensor. Damage to the oxygen