Question about Cars & Trucks
P0420: Catalyst Efficiency Below threshold. means catalytic converter is not performing to standards may need to replace cat. not sure if those guys that soak theirs even works in the long run. be sure to have any other engine running problems fixed before replacing cat to prolong its life.
Posted on Nov 04, 2012
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Posted on Jan 02, 2017
a code 12 means no G or Ne signal to the ecu im put side for at least 2 seconds that code is ground (G) so it is an open or short to ground on the ECU threw the STA circuit
Posted on Jun 28, 2009
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