hey guys, i have a 380 and the engine light is on.
it has the codes
P2187
P2189
P2421

some people say its the o2 sensors but others tell me that o2 are fine, the emission valve has a problem.

this is the pic of the scan tool showing the engine codes

http://i58.tinypic.com/x6fr5f.jpg

any help would be appreciated, thank you

I had lean idle code last year


Turned out LPG was too rich, so petrol ECU learned -15% long term fuel trim, which triggered lean idle on low/trailing throttle


Reset LPG to get fuel trim close to zero and problem solved


Can your scan tool read your fuel trim?


Maybe emission valve is the trigger?