Question about Toyota RAV4
Cel lights came on. took to mechanic adn it was found that the rear o2 sensor would read 0 volts at start up and only begin to vary in its reading after warming up for about 5 minutes. the wiring to the rear sensor was checked for continuity and shorts or opens and found to be in good condition. a new rear 02 sensor was purchased from toyota and installed. the new sensor showed the same excessive warm up tine and the two codes came back shortly after they were cleared.
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Posted on Jan 02, 2017
P0342 is set when the ECM does NOT receive a signal from the CMP snsr. You may very well have GOOD continuity between the ECM and pin 2 (000.2 ohms), but that wire, if grounded someplace (shorted to ground or to another wire in the harness), the ECM will not/does not get a clear/proper signal. Look for a problem in the wiring harness.
Posted on Sep 07, 2009
all your sensors run off the 5 volt ref. so you will have to trace your wiring harness from the pcm\ecm all the way out under the hood to locate the broken or pinched wire.
Posted on Feb 26, 2010
did u change the right o2 sensor there is 2 sensors on bank1 and 2 on bank2.....upstream and down stream.....i had the same prob i changed the o2 senser to the other side to check and make sure it was the o2 senser....it took 4 o2 sensors before i got 1 that finally worked nd yes i was buying them brand new.....so change sides with it nd see if the code changes sides....and did u reset it with the code machine when u put the new 1 in?
Posted on Mar 28, 2010
Testimonial: "i wont no if this is a successful answer until i can reset the code thank you"
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Jul 06, 2012 | 1996 Jeep Grand Cherokee
Jan 27, 2012 | 2003 Jeep Liberty
Potential causes of an P0156 code
If you have access to a scan tool, check
the signal voltage for the Bank 2,2 oxygen sensor with the engine at normal
operating temperature. Is it stuck low currently? If so, increase RPM for a few
seconds and see if it affects the reading. If it begins working with increased
RPM, check for holes in the exhaust near the o2 sensor that may cause a false
lean. If the exhaust pipe is intact, the sensor is sluggish, replace it.
If the Bank 2,2 o2 sensor voltage reading remains low with increased RPM, unplug it and then observe the reading. It should have increased to about 0.5 volts or thereabouts. If it did, check for water intrusion or other connector problems. If none are found, replace the shorted o2 sensor. If the voltage reading is still stuck low after unplugging the sensor, then suspect a wiring problem. Using a voltmeter, with the o2 sensor unplugged, check for voltage on the signal circuit at the o2 sensor connector(PCM side). It can vary with model, but should be about 0.5 volts and not above 1 volt. If the voltage reading is too high, repair short to voltage on signal circuit. If the signal voltage checks out, suspect the PCM.
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