Warm Up Catalytic Converter Efficiency Below Threshold
#1
Warm Up Catalytic Converter Efficiency Below Threshold
Anyone else get P0421 code? It cleared by itself after a couple days, but not sure if the catalytic converters tend to fail or not? Just under 80k miles on my 2016.
#2
not usually.
An exhaust gas leak can cause the issue, this is the first thing to check for.
Then check the sensors are working ok.
If these are all good then the cat will be faulty, but it seems premature for its age
An exhaust gas leak can cause the issue, this is the first thing to check for.
Then check the sensors are working ok.
If these are all good then the cat will be faulty, but it seems premature for its age
#3
#4
#7
Makes sense, very intermittent though, it seems as if it only comes on when it’s damp or raining. Did you notice any additional noise with the flex pipe leaking?
#10
P0421 outlander
I'm having the same code p0421 on my Outlander. Did you figure out what was wrong with yours?