My 2000 infiniti g20 is giving me 13mpg and when i plugged in the computer it says o2 sensor heater circut bank one sensor 2 could it be that the reason why is wasting so much gas?

Asked by Feb 03, 2013 at 10:39 AM about the 2000 INFINITI G20 FWD

Question type: Maintenance & Repair

2 Answers

109,145

Because your O2 sensor is bad. The O2 sensors read the exhaust and regulate the fuel mixture. When they go bad, they send a rich mixture to protect the engine. The CEL light comes on, cooling fan turns on, power is reduced, and your MPG's drop. -- You can buy another sensor at RockAuto.com and replace it.

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