DTC P0133 OR P0153: HEATED OXYGEN SENSOR (LOW RESPONSE) Mazda 626 GF

Note. DTC P0133 applies to front heated oxygen sensor (2.0L) or right front heated oxygen sensor (2.5L). DTC P0153 applies to left front heated oxygen sensor (2.5L).

Diagnostic Aids

Only use this test to diagnose the following

1. HO2S and sensor connection.
2. Vacuum systems.
3. Fuel injector and/or fuel injector circuitry.
4. Powertrain Control Module (PCM).
5. Electrical circuits (HO2S, HO2S GND, INJ 1-4 or INJ 1-6, VPWR and SIG RTN). NOTE: HO2S may be displayed on scan tool as 02S.

To prevent replacement of good components, be aware, the following non-EEC areas may be cause of driveability concerns

1. Air intake system.
2. Fuel system.
3. Exhaust system leaks or restriction.
4. MAF sensor.
5. Engine cooling system.