code p0420 continuing problem
#1
code p0420 continuing problem
have 2004 accord exl 4cyl with check engine light on Advance Auto got code p0420 replaced cat and down stream oxygen sensor cleared code at approx. 170 mlies light comes back on Advance Auto checks and gets same code. what else could I try?
#2
But that suggests good for you; I just don't really have those $$ as easily available.
My '97 has been driving very fine (w/ good mpg) this entire month with check engine light on.
So, unless I have a driveability issue, I look at the CEL as a 'Clear Et Later' light.
My $.02
#4
Have you checked for exhaust leaks? Intake manifold leaks.
P0420 is the second O2 sensor detecting a problem with the amount of oxygen in the exhaust after the catalytic converter. Over 90% of the time, replacing the catalytic converter will fix the problem, but other items can cause this to happen. I would start with the basics first like running some fuel system cleaner like the chevron techron stuff. How many miles are on the spark plugs? Have you inspected the air filter?
P0420 is the second O2 sensor detecting a problem with the amount of oxygen in the exhaust after the catalytic converter. Over 90% of the time, replacing the catalytic converter will fix the problem, but other items can cause this to happen. I would start with the basics first like running some fuel system cleaner like the chevron techron stuff. How many miles are on the spark plugs? Have you inspected the air filter?
#5
You Might Have This Checked...
WheelBrokerAng
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reddcode
Headers, Intake, & Exhaust
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04-25-2007 10:10 PM