Elm327 Bluetooth
 

its here, I'm so excited because my check engine light came on 2 days ago
the package from china was tiny
installing software...
10 minutes later...
Stored code p0421 Warm up Catalyst Efficiency Below Threshold (Bank 1)

code has to do with long warm-up time
i'll attribute that to the -27 temperatures and the car sitting outside.
reset the code

did you google for p0421 ?

elm 327
 

I am dealing with code "lights" and looking in to a code retreival system.

The elm327 came up and I notice you have used one. Can you give me a review of the system and if you are satisfied with it ?

Thanks.. 2000 vw Jetta 32+mpg

no