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Re: 97 es300 cel = p0135
Don't forget a heated H02 sensor has a fuse.
The down stream HO2 sensor just tells the ecu, if the catalytic converter is working, I would have no problem putting a used one in for the replacement.
The most important HO2 sensors are upstream for the air/fuel mix.
Consider buying two new H02 sensors for banks 1 & 2 upstream, and put the used ones down stream.
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