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catalist below threshold code po420 97 merc grand marquis 4.6
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Slp     Reply with quote
engine ligh on steady
Dont     Reply with quote
well sounds like a bad catalytic convertor and its not doing its job
Emilio     Reply with quote
The catalist sensor could be bad. They are called the downstrean O2 sensors. The catalist convertor may be bad, the best way to diag this is have a Ford dealer go through the step by step tests.
Strong     Reply with quote
usally means the cats are bad and need to be replaced.but take it to someone u trust whose a mechanic and have them test it fully to make sure there arent any other things wrong also
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