Focus Fanatics Forum banner

1 - 1 of 1 Posts

·
Registered
Joined
·
6 Posts
Discussion Starter #1
I've been measuring upstream o2 sensor voltages trying to diagnose a P0420 code on my 2012 SEL MT. I noticed it stays steady at 1V most of the time, but on deceleration engine braking, the voltage jumps to 2.0V for a bit and then will come back towards 1V. Is this normal?
 
1 - 1 of 1 Posts
Top