The 1998 Toyota Avalon oxygen sensor fuse can be found in the fuse box. The oxygen sensor fuse will be the number 17 fuse.
Open the hood
A/F sensor are located in each exhaust manifold, O2 sensor After catalytic converter on exhaust pipe
bank 1,sensor 1 oxygen senor by exhaust manifold
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There is most likely 2 or 3 O2 sensor's on your car. Just follow the exhaust system starting from the motor you should see them.
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bank 1 is the one closest to the firewall. sensor 1 is the first one exhaust gasses will come in contact with after leaving the cylinder head.
On a 1998 Toyota Avalon, there are typically two oxygen sensors: one located before the catalytic converter (upstream sensor) and another after the catalytic converter (downstream sensor). The upstream sensor is positioned on the exhaust manifold, while the downstream sensor is found on the exhaust pipe, just before the catalytic converter. Accessing these sensors may require lifting the vehicle for better visibility and reach. Always consult a repair manual for precise locations and procedures.
under the intake manifold