5 L4-2.3L (2007)
Oxygen Sensor: All Technical Service Bulletins
Engine Controls - MIL ON/DTC's P0131/P2251
Bulletin No: 01-015/10
Last Issued: 02/15/2010
Subject:
MIL ON WITH DTC P01311 P2251 DUE TO A/F SENSOR HARNESS DAMAGE
APPLICABLE MODEL(S)/VINS
2007-2009 Mazda3 (NOT including Mazdaspeed3)
2007-2010 Mazda5 vehicles with VINS lower than JM1CR******367196 (produced before November 6, 2009)
DESCRIPTION
Some vehicles may experience the MIL on with DTC P0131/P2251 because the A/F sensor connector bracket contacts and damages the sensor harness.
To prevent the interference, the shape of the sensor connector bracket has been changed.
DTC P0131: A/F sensor circuit low input
DTC P02251: A/F sensor negative current control circuit open
Customers having this concern should have their vehicle repaired using the following repair procedure.
REPAIR PROCEDURE
1. Verify customer concern.
2. Inspect the A/F sensor harness for damage.
a. If the harness is damaged, bend the sensor harness connector bracket according to the following steps to prevent interference, then replace the
A/F sensor with a new one. Refer to Service Bulletin 01-051/09.
b. If the harness is not damaged, this information is not applicable. Refer to MS3 online instructions for troubleshooting procedure.
3. Cover the tips of some pliers with vinyl tape (A) to prevent damage (and future risk of rust) to the surface of the bracket.
