The check engine light came on, I read the codes U0420 and U0423. What are these codes? hi, this is an obd2 trouble code table, it can help you understand the meaning of code.
u0423 jeep patriot no other codes using a real scan tool if not you will miss most DTC errors. use a real tool not just the silly dash bs VFD codes. the dash is like the tip of an iceberg. see? (*****
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