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Lambda/oxygen Sensor And Battery


toyota_richard
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Hi, guys

I need some kindly help from you

I have a 2001 toyota avensis 1.8 vvti GS (petrol), it has done 72k.

Recently both the 'check battery' and 'check engine' light are on.

I used fault code reader and got P0135: O2 heated sensor circuit malfunction (bank 1 sensor 1).

Want to know if that is possible that o2 sensor is all right, but the fault comes from the Battery supply to that sensor circuit.

Booked the diagnosis from toyota dealer, and before go, I want to get some information.

By the way, how many precat o2 sensors for my car? how many for postcat.

Actually I can find two precat o2 sensors, looking from normal position.

but don't know if there are two more underneath.

thanks guys

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