172, are USA standard, spec, DTC error.
and as such , all posts covering it should be same.
P0 means fed, rules.
this only means, this sensor reads too rich.
mostly it is 2 things, #2 is vast things.
1: the sensor is bad. B1S1. (bank1sensor 1) sensor 1 is front.
2: Air fuel ratio , fueling is very very rich,
a technician does more tests to find the true cause.
You could replace and over 100k mile sensor, and find it still throws
172s./
that means the EFI is out of control, its rich for many reasons
1: too high fuel pressure? use a gauge.
2: leaking injectors. (same gauge above doing the leak down test stated in the FSM. and not skipping the injector balance tests.)
3: Misfire , for any reasons, (vast) that cause EFI to go rich.
hard to beat this list, but there are many tests to do
even coolant temps, wrong.
http://repairpal.com/OBD-II-Code-P0172-and-P0175
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