Improper fuel-air ratios can lead to loss of engine power, loss of acceleration and stalling as well as rough idle problems along with check engine light illuminating. This can be due to P0042 error indicating problem with H02s heater control circuit. P0042 is telling us the ECM has detected a fault in the heated oxygen sensor control circuit for bank 1 sensor 3. Parts Avatar Canada is here to provide solution to all your car problems be it any model. Our online parts store is open for your orders 24/7.