code p0420 for subaru legacy

S

swikman

i have a code p0420 for my 1997 lagacy low cat effi, and the car hesatates
some times when i start out,i saw a post saying to replace the manifold
gasket and to check for leaks will that cause the hesitations or does it
mean that the cats are clogged up?
 
The code indicates the cat is worn out. Your hesitation may be unrelated
unless the cat is sufficiently clogged to create excess backpressure and
reduce engine power. If you have less than 80K on the car the cat may be
covered by the emissions warranty, consult a dealer. Either way the cat
should be replaced.
 
swikman said:
i have a code p0420 for my 1997 lagacy low cat effi, and the car hesatates
some times when i start out,i saw a post saying to replace the manifold
gasket and to check for leaks will that cause the hesitations or does it
mean that the cats are clogged up?
Seems to me that is the code I saw when in actuality, the problem was
the gas cap. Tank is required to be sealed and if cap is loose or
rubber seal damaged or dirty the seal is lost. I would check here
first make sure all is well with seal and I bet the code will go away
within a few days.

Mickey
 
"low cat effi" is usually caused by exhaust leaks on the engine side of the
main converter. Although cats do wear out that is rarely the problem on
these cars...lots of cats are replaced though due to ignorance. Do some
other diagnostics on the expensive cat first...how is exhaust flow?TG
 
The code indicates the cat is worn out.

Not necesarily ["low cat effi" is usually caused by exhaust leaks on the
engine side of the main converter. Although cats do wear out that is rarely
the problem on these cars...lots of cats are replaced though due to
ignorance. Do some other diagnostics on the expensive cat first...how is
exhaust flow?TG]

Your hesitation may be unrelated
 

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