Code 26, air / fuel ratio rich malfunction Options

[Bigmeanbulldog55]

I've been getting a code26 from my car. That's the rich air/fuel mixture code. I know, the 5sfe runs rich anyway, but not enough to throw a code. I know my EGR is needed cleaned. I also know that I welded close to my O2 sensor not too long ago. To stop the CEL, I unplug the O2 sensor and reset the ECU. This works, but I know it's not right. I was thinking it was either the O2 or the EGR, but when I look in the Haynes manual, it's saying: injector circuit, injector, air flow meter, cold start injector, or ECM. Anyone have any advice for me?

[bindertch]

You can only read the O2 sensor if you have a really good digital meter or if you have a graphing meter. What you would be looking for is a switch from .2V to .8V as the ECU adjusts the A/F ratio. The other two sensors can be read by using a pin slid into the back of the connector and measuring the voltage on a multimeter. Also the ECT can be read using an Ohm meter. You can read it when the engine is cold and then when it is warm looking for low resistance when hot and high resistance when cold.