Catalyst not ready evaporative not ready o2 heated ot not ready
Old school computer system, try cleaning the connection on the ECM on top of the coolant bottle(pass side). Buy contact cleaner and some dielectric grease. clean the connector and apply grease...them reconnect. Make sure your battery is disconnected before you attempt this.
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SOURCE: 04 Monte Carlo 3.4L won't
If the code you have is p0420, then it sounds like you mayu have a bad catalytic converter. This will inturn cause the oqygen sensor codes, It may still be under warranty. The warranty is up to 125k miles.
SOURCE: 2001 chevy s-10 pickup again. Not Ready codes. This time I am
you will need to drive approx 500 miles it will eliminate the not ready but will bring back the codes
Testimonial: "Thanks. I thought I would just need to drive it a few miles (two or three trips). I would have been really frustrated that it did not fix the problem."
SOURCE: 1999 Subruban 1500 LT Failed Emissions Test:
You may have a defective coolant or air temp sensor. These need to be accurate in order for some of the monitors to run. Your going to need a diagnostic scanner to see the data so you can determine what is wrong.
If you had replaced or unhooked the battery just pryor to geting the smog then thats the problem. Just drive the truck for a couple days and you should be fine.
You will still pass the test if you still have 2 monitors not set. California allows that. 3 fail
SOURCE: the obd monitor results come back as not ready
Monitor not ready or not set,is a result of recent disconnection of battery or clearing a check engine light, The vehicle has to see a drive condition before it set,its usually a two trip condition meaning a cold start at 60 F to operating temperature of 160F. twice. And being driven.
The
code PO420 you have is Catalyst System efficiency is below threshold bank one.
Usually replacing the O2 sensor that's the front most in the exhaust system
will cure your problem,
Your Check Engine light
is on and you find a P0420 code for a catalytic converter fault. Does that really
mean your converter has reached the end of the road and needs to be replaced? A
new converter can cost $600 to $1000 or more if a new car dealer or repair shop does the
job, or maybe half that amount if you do it yourself. It's an expensive fix
that may or may not be necessary. The problem, in most cases, is an emissions
issue, not a performance issue that affects the way the engine runs.
A P0420 diagnostic
trouble code is a "generic" fault code that is set when the Onboard Diagnostic II
(OBD II) system sees a drop in converter efficiency. The
OBD II system monitors catalyst efficiency by comparing the switching activity
of the upstream and downstream oxygen sensors in the exhaust. The upstream O2
sensor in theexhaust manifold reflects the
condition of the exhaust gases as they exit the engine. The downstream O2
sensor in or behind the catalytic converter reflects the condition of the
exhaust after it passes through he converter.
The catalytic converter
is like an after-burner. It oxidizes (burns) any residual fuel vapors (unburned
hydrocarbons or HC) in the exhaust. It also burns any carbon monoxide (CO) in
the exhaust. The exhaust must meet federal emission standards, and if a problem
exists that causes emissions to exceed the federal limits by 150%, the OBD II
system is supposed to catch the fault, set a code and turn on the Check Engine
light.
Thanks
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