Question about 1998 Buick LeSabre
Your PO-420 Code may be a failed converter,and the reason you fail inspection.
Posted on May 20, 2010
Have you replace the fuel filter sit under the car close to the gas tank, part #481 also there's a valve under the hood on top of the engine on the fuel injector rail to check fuel pressure, you will need a fuel pressure gauge, I would check that 1st before replacing fuel pump, good luck, hope this was very helpful.
Posted on May 17, 2010
Start with the fuel filter... about $15 at the parts store
then check fuel pressure
ideal should be 35+ with engine running
less than that after replacing the fuel pump = failing pump!
Posted on May 14, 2010
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Posted on Jan 02, 2017
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