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Toyota Sensors

How many oxygen sensors in a 1999 RAV 4 Toyota with California emission standards?

and where are they on the vehicle?

Probably 2, the first one measures the oxygen in the exhaust gases before the catalytic converter to determine how much fuel the injectors should squirt, and the second one measures the exhaust after the catalytic converter to make sure it is doing its job. is great info on rav4s use search to find what you want