Re: 2001 Toyota Echo P0141 O2 Sensor Heater Fault (Bank1 Sensor 2)
Yes - fix the exhaust leak before replacing sensors.
Given, a snsor may still end up needing to be replaced, but many O2 sensor codes come from the difference between pre- and post- cat O2 levels - an air leak pre-cat will obviously make this a wrong reading and pop a code.
But, there may be something else wrong besides the air leak.
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