That's a lot of miles! Get the oxygen sensor checked, I'm wondering if its going south and leaning out the mixture too much. I think you need a good tech to go through the sensors that control mixture. Inlet air temp, water temp, CO, exhaust temp etc.
Thanks and i have another question i know its running lean could that be making it ping on acceleration.i run a high octan gas and no change
You say going south do you mean gonna need a rebuild?
Thanks thats helps alot now just up to me to fix it
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SOURCE: Pulled code p0420 on 99 chevy astro, 2wd, v6
from what i am finding the code means o2 sensors. they recommend replacing them and if this does not work than replacing the cat converter
The catalytic converter has an oxygen sensor
in front and behind it. When the
vehicle is warm and running in closed loop mode, the upstream oxygen sensor
waveform reading should fluctuate. The downstream O2 sensor reading should be
fairly steady. Typically the P0420 code triggers the Check Engine Light if the
readings of the two sensors are similar. This is indicative of (among other
things) a converter that is not working as efficiently as it should be (according
to specs). It is part of the vehicle emissions
system.
causes
A code P0420 may mean that one or more of the following has happened:
possible soloutions
Some suggested steps for troubleshooting a P0420 code include:
One thing to note is that many vehicle manufacturers offer a longer warranty
on emissions-related parts. So if you have a newer car but it's out of it's
bumper-to-bumper warranty, there still may be warranty on this type of problem.
Many manufacturers give a five year, unlimited mileage warranty on these items.
It's worth checking into.
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yes, weak mixture gives excessive pinging, or predetonation as its called. Get it on a diagnostic machine and see whats wrong.
Oxygen sensor is screwed into the down pipe on the exhaust. It can be tested with the right gear. But I think you need to check all sensors because you say it runs OK basically, just very weak.
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