Check engine lite on

Question

What is the meaning of this code: p0128 and p0420

Answer 1

Hi there

P0128 points to an issue with the thermostat or cooling system on the car.

P0128 - Coolant Thermostat Malfunction

Read more: https://www.autocodes.com/p0128.html

P0420 is an issue with the bank 1 catalytic converter 

P0420 - Catalyst System Efficiency Below Threshold Bank 1

Read more: https://www.autocodes.com/p0420.html