Chevy Impala SS Forum banner

1 - 3 of 3 Posts

·
Registered
Joined
·
192 Posts
Discussion Starter · #1 ·
I noticed the "check engine" light was not coming on when I turned the ignition on, Car runs decent however I scanned for codes and I got back 420 and 1661. These are OBD2 codes and I have read "various" things online, but does anyone on here have specific insight into what exactly these codes mean for a B-body?


Thanks,.
 

·
Registered
Joined
·
3,612 Posts
P0420 - Catalytic converter system - low efficiency - Bank 1. In other words, your driver side cat is dying, or there's an issue with your after cat O2 sensor.

P1661 - Malfunction Indicator Lamp control circuit. There's either a short in the wiring for your CEL, or the bulb is burned out or missing.
 

·
Registered
Joined
·
192 Posts
Discussion Starter · #3 ·
Thx Cletus

I read about the 1661 and it said it could be an evap system code or the actual gas cap? But where the "CEL" is not working I am going for that first. Also I plan on repairing the fading odometer at the same time. cwm1
 
1 - 3 of 3 Posts
Top