Hello,
The code:
P0128 ECT Below Thermostat Regulating Temperature
P0410 is for the secondary air injection system.
The coolant temperature code can exists due to faulty wiring or too much resistance in the wire or the sensor.
The secondary air injection code is an emission code. Your vehicle may run ok but it may not pass smog test, as the emission system is not performing as it was designed.
The secondary air injection system is designed to reduce exhaust emissions after initial engine start-up.
I have attached the step by step diagnostics for both of these codes. This will narrow down the issue and help you get it resolved.
https://www.2carpros.com/trouble_codes/obd2
Please let me know of any questions.
Thank you.
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Friday, August 27th, 2021 AT 4:38 PM