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lexuswhipt

Code 21

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This is the only code that came up when i used my obd1. The book states HO2S sensor/heater or circuit,ECU. I hate to sound lame but what does that mean? Where is the HO2S sensor? Is it the one just off the exhaust manifold? I need to get smog cert. and this is basically whats holding me up. Also can anyone tell me where i can get a repair manual for my 94 Gs 300. One that can help with this type of problem.

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Code 21 is left bank [radiator side] O2 sensor, code 28 is the right bank [firewall side] O2 sensor. Can't help with a FSM, but I guess there are some DIY's available if you search.

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