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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