P0136/running rich

[cantaloop]

Hi everyone,
'96 4banger. So whenever I drive with my windows down, I can smell a loooooot of fuel, obviously its running rich. I've also been getting pretty bad gas mileage which indicates running rich. And I've also been throwing a P0136, which from what ive read means that I need to replace the Downstream O2 sensor.

Thing is, the downstream O2 sensor looks fairly new (I don't know much about the history of this truck). And it had a brand new single catalytic converter booger welded in right before I bought it. The upstream O2 sensor looks original, which makes me believe that it probably needs replacing, since everything else has pretty much been replaced. Would replacing the upstream O2 sensor take care of the P0136/running rich? Thanks.


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[JayRolla]

Hi everyone,
'96 4banger. So whenever I drive with my windows down, I can smell a loooooot of fuel, obviously its running rich. I've also been getting pretty bad gas mileage which indicates running rich. And I've also been throwing a P0136, which from what ive read means that I need to replace the Downstream O2 sensor.

Thing is, the downstream O2 sensor looks fairly new (I don't know much about the history of this truck). And it had a brand new single catalytic converter booger welded in right before I bought it. The upstream O2 sensor looks original, which makes me believe that it probably needs replacing, since everything else has pretty much been replaced. Would replacing the upstream O2 sensor take care of the P0136/running rich? Thanks.


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Replace the o2 sensor with OEM or denso replacement. Issue fixed.

 

[Harleydoc]

Is that the only code it is having if you have a miss fire code that might be your problem


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[cantaloop]

Replace the o2 sensor with OEM or denso replacement. Issue fixed.

Upstream or downstream?


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[JayRolla]

Upstream or downstream?


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If sensor 1 looks original and your running rich I would replace that sensor. Problem with the code is the if one sensor is bad it can give a false reading. I just replaced both at the same time when I did mine i believe.