How do you repair codes PO300 and PO440

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1997 BUICK LESABRE
180,000 MILES

How do you repair codes po300 and po440

Thursday, April 11th, 2013 AT 3:11 AM

1 Reply

JACOBANDNICKOLAS

MECHANIC
109,747 POSTS

The PO300 is a multi-cylinder misfire. That can be the result of many things. When was the last tune up? Have you checked fuel pump pressure? As far as the PO440, Evap Emission Ctrl Sys Error, that too is a very vague code. Anything I would say would be a guess.

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Thursday, April 11th, 2013 AT 3:32 AM

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