I cant pass the emissions test because the overall readiness results fail.;i had to drop a new engine it (2AZ-fe). i drove it for a few days to get over 100 miles and it still says not ready. what else could be the problem?
SOURCE: My Rav4 2002 just failed the emissions test, what
its indicating that the memory on the computer has not gone its learning cycle
every time the ecu (electrinic control module)
its reset it doesn't know any information on the vehicle
so you need to drive it so it can do a relearn process and it checks to see if you have any problems , if you have problems the check engine will come on
on your vehicle comes up not ready so drive it
did someone fix it or did you replace the battery ?
what you have to do is drive it for 50 miles and some times up to 300 hundred miles
SOURCE: Toyota camry 2001emission not ready (Readiness == Fail )
The P0420 code, usually associated with a weak cat converter, is in fact often caused by an ageing (weak) downstream O2 sensor. On both my cars at around 150K miles replacing the downstream O2 sensor was all that was needed to clear the code. No cat replacement was necessary. If one actually spends some time reading the diagnostics procedure for this code, they will find that the O2 sensor diagnostic is the first thing to do before replacing the cat converter. The downstream sensor, the one after the cat converter, gets "lazy" with age. This means that it no longer produces voltage signals as it used to. The result is that the voltage swings that come out of it begins to follow very closely the voltage that is generated by the upstream O2 sensor. When this happens, the car computer thinks the cat converter does not do its job (which might as well be the case too, but the O2 sensor is the first thing to try). With a code scanner with live data stream you can see the voltages coming from the O2 sensors. Check-out my write-up on the 2002 Toyota Prius cat converter replacement on http://www.pbase.com/kocho/exhaust_prius
- I got some details there. And see my comment for Dennis above here too
A service technician will
turn off the dashboard "check engine" light after most repairs. This
resets the vehicle's emission system components to "not ready". The
status remains "not ready" until the vehicle's computer has had adequate
time to review the repaired component. This happens after the vehicle
is driven for a period of time established by the manufacturer.
If the vehicle's emissions system status is "not ready" when it is presented at the E-Check station during the initial test cycle,
a tailpipe emissions test may be conducted. If the vehicle is
transferred to another test type, the vehicle must remain on the
different test track until the vehicle passes the emissions test or
receives a waiver. For example, if the vehicle undergoes an OBD II test
and fails, it cannot be downgraded to a tailpipe test on a re-test; the
vehicle must pass the OBD II test.
For initial and subsequent tests, if a dashboard light is on when the vehicle is presented at the E-Check station, the vehicle will fail the test.
How can the vehicle status be made ready?
When a vehicle is driven through its normal drive cycle, the computer reviews the emission control
system and if the vehicle was properly repaired, the system resets itself to ready. A normal drive
cycle includes operation at both cruising speeds and in stop-and-go traffic for up to a couple
weeks. This process should be followed before bringing the vehicle in to be tested.
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