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Both sensor codes on with engine light.
Vehicle: 2 013 Chevy Sonic

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Hi there

P0597 means there is a problem with the thermostat heater control circuit. It is likely the thermostat heater causing the issue.

P0171 is for a lean fuel mixture. There can be several causes for this. Vacuum leaks, low fuel pressure or even a bad front O2 sensor.

P0597 CHEVROLET - Thermostat Heater Control Circuit Open

Read more: https://www.autocodes.com/p0597_chevrolet.html

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