Having problems with your 1999 Chevrolet Silverado 1500 ?

Codes po404 and po405, what are the pprblems resulting from these codes, what are the fixes?

Posted / edited by AnonymousUser on : 20-01-2020

Answers :

These should be auxiliary emmisions codes....shouldnt cause problems...I work for chrysler but codes are basically the same...you need to have an emissions machine hooked to it...It is all
\012enviornmental components...You could have a vacum leak or something simple..Have you ever done work to the exhaust system ?...could be a short to ground or loose connection in the harness also.Sometimes you can unplug then replug connectors at the component and solve the code problem because wiring will make the PCM think it is bad when it actually isnt..The PCM activates the ground for all components only after identifying the connection is complete...
\012........Hope this helps.................................Metalpoet........................
Repair Help & Product Troubleshooting for 1999 Chevrolet Silverado 1500

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