SOURCE: trouble code 1131 lack of ho2s bank 1 sensor 1 switches sensor
if sensor indicates lean check the fuel trim if long term fuel trim is above +7 them test sensor with a piko lab scope or watch scan data and create a rich condtion by snping the throttle wide open and watch the sensor if it start to read around 700to 900mv its ok, then create a vacume leak and the sensor should read 100to 300mv i your sensor is in this range quickly its good with in 1to2 sec.
SOURCE: engine light on got a code of poo31 Ho2s bank 1
thats the pre cat o2 sensor. usually this mean that it needs replacing
SOURCE: I have a 2000 saturn
replace the oxygen sensor closest to the cadalatic converter, that is the bank 2 sensor, that should fix your problem
SOURCE: P0032 is the code. Where is the sensor? HO2S
this is the circuit for the heater element in your o2 sensor it is in your exhaust pipe it will be pre catalytic converter.
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