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I have code 21 on obd1 scanner for toyota corolla 1995 its an main oxygen sensor but i don't know if it upper or lower is it in front by motor or under the car by cataletic coverter

I own a toyota corolla 1995 with check engine light on i checked it out with obd1 scanner it came out with code 21

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: engine diagnostic codes

I don't have a dodge ram but the codes for the dodge vehicles where pretty much the same. For my intrepid the codes read for the following numbers

12 - Problem with battery connection (This usually happens if you disconnect the battery)
21 - Problem with the oxygen sensor circuit
52 - Oxygen Sensor signal input indicates rich mixture during engine operation.

It sounds like you may need to change an oxygen sensor. Hope this helps.

Posted on Oct 13, 2008

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SOURCE: 2001 toyota corolla check engine

Mass Air Flow sensor! Just remove your air filter cover. Go to Auto Zone and purchase some solvent. Spray past the air filter and it should correct the problem. If not, replace the Mass air-flow sensor. This is commonly mistaken for an oxygen sensor. Mine did this and I followed these steps and it fixed the light. BTW, the light stayed on for 5 years before I fixed it. Never hurt anything. It's normally something to do with emissions. Dummy lights. :)

Posted on Mar 30, 2009

libaredneck
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SOURCE: Check engine light code P0171 activated on my 2001 toyota corolla

p0171 is lean condition bank one. you could have a vacuum leak a bad map sensor bad maf sensor clogged fuel filter low fuel pressure. start with the vacuum leak first.

Posted on May 05, 2009

RixsFixes
  • 2200 Answers

SOURCE: I have an engine light on to my Toyota Corolla

Hi

The trouble areas associated with this code are as follows:
1)Gas leakage on exhaust system
2)Oxygen sensor
3)Heated oxygen sensor
4)Three–way catalytic converter

The idea is to check for exhaust leaks first then the front sensor and rear sensor. If these all check out then the cat needs to be replaced.

Hope this helps. Thanks for using fixYa

Posted on Nov 06, 2009

  • 1 Answer

SOURCE: check eng light trouble code PO420 bank 1 on

My 2002 Camry V6 is having some issues. Went in for an oil change that turned into a front struts, springs and mounts job. Then I was having some problem in the higher speeds waiting for the car to shift, so had a tune up done, which meant new spark plugs, and of course, the gasket! So now I am out about 1K and now the check engine light comes on. Had it checked out and and a catalytic code came up. They fiddled with it and got the check engine light off, but now the VSC and TRAC OFF lights are on. What does all this mean? Should I take the plunge and get the cat converter done now?

Posted on Aug 18, 2010

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I had a code 26 so i replaced both 02 sensors on my 95 Toyota Camry and the same code keeps comming back


In that car I have code 26 listed as ""Air/fuel ratio rich". The oxygen sensors are listed as 21 or 27.

26 could indeed be caused by a failed oxygen sensor, but it is more likely to be a stuck cold start injector or a failed coolant temperature sensor.

Jul 06, 2017 | 1995 Toyota Camry

2 Answers

I need the list of codes for a 1994 corolla


1.6 GLi COROLLA

DTC NUMBER TROUBLE AREA 12 clip_image001.gifRPM signal 13 clip_image002.gifclip_image002.gifRPM signal 14 IGN signal 16 ECT Signal 21 Oxygen sensor signal 22 Water temperature signal 24 Intake air temperature sensor 25 Air / Fuel ratio lean 31 Vacuum sensor signal 41 Throttle sensor 42 Vehicle speed sensor 43 Starter signal 52 Knock sensor 51 Switch COND

Sep 29, 2014 | 1994 Toyota Corolla

2 Answers

41 thrt val sol


P0041 Oxygen Sensor Signals Swapped Bank 1 Sensor 2/Bank 2 Sensor 2
looks like your wires and melted together or a rodent has chewed them

Feb 10, 2012 | Mitsubishi Montero Cars & Trucks

1 Answer

Dtc 21 codes check light


This is a dtc for the main oxygen sensor, or MOS heater.

Some models don't have a heater on the sensor, indicated by a single wire connection. If the sensor has a heater, there is a 4 wire connection.

The fix is usually to replace the whole unit. It helps to have the exhaust hot when this is done, but take care. You might also need a long socket with a slot up the side of it.

Nov 12, 2011 | 1993 Toyota Camry V6

2 Answers

Has a code 21


main oxygen sensor.........open or short in the heater circuit of the main oxygen sensor.......hope this is what you needed and if you need more info let me know....let me or fixya know if i was able to help you and a thumbs uo and a comment would be appreciated......thanks and have a blessed day............good luck........

Jun 26, 2011 | 1991 Toyota Pickup

1 Answer

DTC P0420 on 99 Toyota Corolla Which oxygen sensor to replace- before or after the catalytic converter?


The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.
Symptoms You will likely not notice any drivability problems, although there may be symptoms.
Causes A code P0420 may mean that one or more of the following has happened:
  • Leaded fuel was used where unleaded was called for
  • An oxygen sensor is not reading (functioning) properly
  • The engine coolant temperature sensor is not working properly
  • Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
  • Retarded spark timing
  • The oxygen sensors in front and behind the converter are reporting too similar of readings
Possible Solutions Some suggested steps for troubleshooting a P0420 error code include:
  • Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
  • Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
  • Inspect the downstream heated oxygen sensor (HO2), replace if necessary
  • Replace the catalytic converter
One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.

May 26, 2011 | 1999 Toyota Corolla

2 Answers

Fault code 21 and 42 on 98 toyota corolla,can u tell me what sensor it is?


21 Oxygen sensor voltage remained between .35 and .7V
continuously despite feedback correction
42 Vehicle speed sensor output doesn't reach the computer

Info From:


http://www.corolland.com/repairs.html

Sep 15, 2010 | 1998 Toyota Corolla

2 Answers

Code 21 on toyota corolla 1993


Code 21 is an oxygen/heater sensor, replace the main o2 sensor and clear the code, or sometimes you can just clear the code and it wont come back. Problems with the o2 sensor are normal and usually not that big of a deal.

Mar 24, 2010 | 1993 Toyota Corolla

3 Answers

I have an engine light on to my Toyota Corolla 2003; diagnosed by the autozone OBD11 SCANNER P420. I replaced the oxygen sensor and the light deleted. After driving the car for 30 miles the light came on...


Hi

The trouble areas associated with this code are as follows:
1)Gas leakage on exhaust system
2)Oxygen sensor
3)Heated oxygen sensor
4)Three–way catalytic converter

The idea is to check for exhaust leaks first then the front sensor and rear sensor. If these all check out then the cat needs to be replaced.

Hope this helps. Thanks for using fixYa

Nov 05, 2009 | 2003 Toyota Corolla

2 Answers

Check engine light - P0420 code


Causes A code P0420 may mean that one or more of the following has happened:
  • Leaded fuel was used where unleaded was called for
  • An oxygen sensor is not reading (functioning) properly
  • The engine coolant temperature sensor is not working properly
  • Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
  • Retarded spark timing
  • The oxygen sensors in front and behind the converter are reporting too similar of readings
Robert

Please rate this solution thanks

Feb 02, 2009 | 2005 Toyota Corolla

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