Question about 2001 Toyota Camry
I need to know the drive cycle for the 2001 Toyota Camry 4-Cyl. after the check engine light is reset. We did a repair on my car and when I went to emissions, they said it had not gone through the drive cycle yet and not ready for emissions test. Also, how can I find out if the drive cycle is complete before going back to emissions?
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Posted on Jan 02, 2017
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
Posted on Nov 11, 2012
drive cycle is you need to drive it between 30-60 miles to make sure your computer relearns all the emissions sensors and then you can get it inspected
Posted on Feb 20, 2013
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