Question about 2001 Toyota Camry

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Toyota camry 2001emission not ready (Readiness == Fail )

My car is Toyota Camry 2001 (4 cyl 2.2 ).
The check engine light was on before, so I went to autozone and theysaid that catalytic converter was bad. It was replaced, the checkengine light went away. So I drove the car to the emissions and it fail becausethe car didn't have enough miles driven for the emissions (READINESS == FAIL) but before taking the car to the emission place I drove the car fortwo weeks, I even took a long trip vacation. I probably put about 1000 miles on it.

Any suggestions? Should I reset the battery ?

Thank you!

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  • Anonymous Dec 09, 2008

    the evap system is not complete. i have a 2001 toyota camery, the cat. and evap have not reset. how many miles are required to reset these systems.

  • Anonymous Mar 14, 2014

    I have a 2001 Mitsubishi Gallant and have to get the drive cycle reseted. How many miles do I have to drive it in order for my car to be ready to pass emissions? What should I do?

  • Anonymous Mar 17, 2014

    The emission alert light came on after being driven 25 miles

  • Anonymous Mar 22, 2014

    emission test can not be done after taking engine light off


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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
- I got some details there. And see my comment for Dennis above here too

Posted on Nov 11, 2012

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The system has to complete a certain number of drive cycles to complete the system readiness function, this is a mixture of stop and go, highway and idling, I admit it should have cleared by now, but try to do a mixture of driving, just highway won't do it, it should complete soon, if it doesn't then there is a problem that will have to be diagnosed.

Posted on Nov 10, 2008

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  • stringfel432 Aug 03, 2011

    Did any of this work? I am having the same issue with my 2001 Camry. Was there an underlining problem. I realize these posts are old, but does someone have a fix for the non-continuous monitors not setting? Thanks

  • Mihail Popov
    Mihail Popov Nov 11, 2012

    I had a similar issue: P0420 (catalitic converter operating below threshold, basically, a weak cat converter). I had this same issue on a Toyota Prius 2002 as well, and from it I knew it could be due to both the cat converter and/or the downstream O2 oxygen sensor. In both cases, simply replacing the O2 sensor (downstream, after the cat converter) fixed the issue and the cars stopped throwing the codes. The Prius has a shorter readiness cycle. The Camry is a 2000 model with almost 150K miles on it now that the P0420 code came. The Prius was of similar mileage when I replaced the O2 sensor, so I'm guessing that there is some limit on how long these things last... The Camry I have been driving daily on short trips for a week now and took several short (20 minutes) highway trips to try to complete the cycles - still not complete. Specifically, the cycle related to the cat converter take longer - the other cycles show complete. I have a scanner that shows this information. Hopefully, it will complete the cycles by inspection time.... Replacing the downstream O2 sensor is not too hard and only requires to lift the car. The wire harness is accessible under the driver seat and Advance Auto Parts sells an already wired replacement that makes things easy. The hard part is that usually the old sensor is well stuck on the exhaust and requires something like "liquid wrench" lubricant to losen-up and a good 22mm wrench that will not round-off the nut while forcing it off. I had a special O2 sensor socket that was no good - a regular 22mm wrench worked better (the wire was already disconnected so I could slide the wire through the wrench's eye and get a very good contact with the O2 sensor's nut. Good luck with the repair!

  • Mihail Popov
    Mihail Popov Nov 18, 2012

    Just a quick follow-up: there is a TSB (Toyoa Service Bulletin) from Marh 2002 that describes in detail the way you *must* warm-up and drive the car in order for the readiness monitor to complete. There are specific drive patterns to follow. For my '00 4 cylinder california emissions camry, the instructions are on page 13. Phase 1 is to warm-up the engine from a coolant temperature from below 176F to above 176F. Basically, start cold, idle until the temp is over 176F. Then go to a rural road and set the cruis control to 40mph and drive for 3-7 minutes (3 minutes if the air temp is over 50F or 7 minutes if the air temp is under 50F). Then start driving a varying speeds between 40-50mph with smooth throttle and no letting-go off the gas pedal (to close the throttle). Follow this and the readiness will complete. I drove for 2 tanks and readiness would not complete. Then found the TSB, followed the instructions and - got the *ready* just as it said I would -;).


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