RoadSpike

On a completely catless system some WRX have been throwing CEL lights with the code p0139. I have come up with a $2 solution using radio shack parts based on the old cel fix.

Included are diagrams of the old cel fix and the new cel fix. Diagrams do NOT include the black wires which heat up the o2 sensor.

I have had this in the car for a little over 3 days without a light

Explanation: (without getting into time delay circuts)

The old cel fix has such a large capasitor that it would nearly delay signal time by 1 second, thus the slow response code. The lower capasitor reading on this cel fix further simulates a o2 sensor by modifing its response time and voltage rating.

It should simulate between .3hz and .8hz pulse times which is acceptable by the 04 wrx ecu.

Attached Images

CEL Fix.JPG (23.9 KB, 1333 views)