Dragonlich1961
NAXJA Forum User
- Location
- Ohio
need some help fiquring out these codes on my 94.
using the key cycle method and couting flashes, i end up with 12, 21, 51.
12. battery disconectoed last 50 key cycles,
21 o2 sensor fault.
51 o2 sensor detects lean condition.
light has been on since a header repair,( replaced cracked manifold). and water pump.
sensor was disconected to remove the wiring harness from the intake.
testing the pins on the chassis side of the conector and with sensor disconectoed. i have .46 volts on the sensor + side, and continuity with the pcm to ground and heated ground.
what am i missing.
o2 sensor is 2.5ish years old. and good quality,
vehicle ran fine before repairs.
nothing i did should have affected the sensor.
94 4.0 aw4. 4x4.
thanks chris
using the key cycle method and couting flashes, i end up with 12, 21, 51.
12. battery disconectoed last 50 key cycles,
21 o2 sensor fault.
51 o2 sensor detects lean condition.
light has been on since a header repair,( replaced cracked manifold). and water pump.
sensor was disconected to remove the wiring harness from the intake.
testing the pins on the chassis side of the conector and with sensor disconectoed. i have .46 volts on the sensor + side, and continuity with the pcm to ground and heated ground.
what am i missing.
o2 sensor is 2.5ish years old. and good quality,
vehicle ran fine before repairs.
nothing i did should have affected the sensor.
94 4.0 aw4. 4x4.
thanks chris