lexuswhipt Posted August 13, 2010 Share Posted August 13, 2010 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. Quote Link to comment Share on other sites More sharing options...
intakerGS Posted August 14, 2010 Share Posted August 14, 2010 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. Quote Link to comment Share on other sites More sharing options...
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