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Cathelic converter light sensors - 2007 Chevrolet Captiva 2.0

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How many oxygen sensors are there on a 1996 ford explorer 8 cyl., 4.0 eng.


The answer depends on the type of exhaust system you have. You will have either 3 or 4 total O2 sensors on your V8. If you have single exhaust with a single catalytic converter then you will have 3 O2 sensors (2 upstream sensors & one downstream sensor - "up or down stream" meaning before of after the catalytic converter). If you have either dual exhaust and/or two catalytic converters then you have 4 O2 sensors (2 upstream & 2 downstream). If you have an MIL light (malfunction indicator light, or "check engine light") the code will indicate "front bank / bank one", which is one of the 2 upstream O2's before the catalytic converter(s), or "rear bank / bank two", which is one of the O2's after the catalytic converter(s).

Apr 22, 2012 | 1996 Ford Explorer

1 Answer

E-Check Light P0125 and pending p1153/p1155. Replaced ECT and codes reappear. Where is this Bank2 Sensor1 located on my 1998 toyota camry v-6 auto with air. P1155Code book described as AF sensor.


Air/Fuel Sensors are mounted upstream of the catalytic converter. They are located on the exhaust manifold side of the catalytic converter (pre-converter - Sensors 1). Oxygen Sensors are mounted downstream of the catalytic converter (post-converter - Sensors 2). The catalytic converter has two chambers (left and right). Bank1 is left, drivers side. Bank2 is right, passengers side. The Bank2 Sensor1 sensor (Air/Fuel Sensor) is the one located on the 'right and ahead' of the converter. The PowerTrain Control Module (PCM) is reporting that the heater or circuit ( wiring / plug-in) of the sensor is malfunctioning.

Jan 31, 2011 | Toyota Camry Cars & Trucks

1 Answer

The engine light stays on, it has an 02 sensor. It may need a new cadillac converter and cv joint.


check engine light on when tested it says bad o2 sensor did you replace 02 sensor it takes driveing it so many miles before light will go off give it couple days you dont need cadillac converter check engine light will go off cv joint they click as you turn dont let a mechanic sell you something you dont need its very rare for cadillac converters to go bad its common for o2 sensors to go bad like yours did but when 02 sensors are replaced it takes driveing it for awhile before it resets itself you also have more then one 02 sensor was then wrong one replaced they screw into your exaust manifold

Dec 13, 2010 | 2003 Nissan Altima

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2002 toyota rav 4 / code po420 whats wrong ?


You have a cat converter ie eficiency code. Most shops are willing to sell you a cat converter and make a quick buck. However you can save some major money if you can find out what is wrong. A cat converter doesn't just go bad by itself something causes it to fail. Most likely a bad oxygen sensor or a dirty mass air flow sensor. I would replace the oxygen sensor in front before I replace converter. Reset check engine light and see if light comes back on. If it stays off you just save about 600 dollars. Oxygen sensors cause cat converters to go bad. So fix the cause first, then if you have to replace converter.

Oct 28, 2010 | 2002 Toyota RAV4

1 Answer

How can I bypass the catalytic converter sensor


You mean the rear o2 sensor. What do you have a converter efficiency code keeping the check engine light on? You don't want to buy a converter but want the light off. If this is what you are asking they make O2 sensor simulators.

Oct 12, 2010 | 2001 Ford Taurus

3 Answers

Check Engine Light was came up with code po430.


its going to be either an o2 sensor(bank 2) or a catalytic converter

Jan 13, 2010 | 1997 Ford Thunderbird LX

2 Answers

Check engine light came on and the OBD II red PO 137 02 circuit low voltage (bank 1 sensor 2)


check o2 sensor rear of cat/ converter for short ,damaged wires or faulty sensor--if exhaust leak repair leak or cat/converter plugging up or restricted

Nov 03, 2009 | 2000 Pontiac Grand Prix

1 Answer

The check engine engine light remains on. I have replace bothe sensors on the catalatic converter. Do I need to replace the converter now? Fred


i would replace sensors and then reset check engine light and drive if light comes back on then replace converter, 80% of the converters are condemed because o2 sensors are bad,garage fiqure if they replace everything there sure to fix the problem,but the cost is on you.GOOD LUCK!!!!

Oct 01, 2009 | 2000 Mazda MX-5 Miata

1 Answer

2003 ES 300 VSC TRAC OFF & CHECK ENGNE LIGHT ALL ON AT SAME TIME.WHAT DOES THIS MEAN?


I have a 1999 ES 300 with the same problem. I took it to an independent repair center, (Big O Tires). They ran the codes and it told them it was one of three oxygen sensors in the car. There are two sensors for the engine, (one on either side of the V6 engine), and one for the catalytic converter. The bad part is this sensor is located AFTER the cat. converter, which means it could be the converter, (about $1500.00), or the sensor, (about $250.00). After checking all sensors, it was determined it was PROBABLY the sensor after the converter. I had the sensor replaced and so far the lights have not come back on. Seeing that your car is a 2003 model, I really don't think it could be the converter. If you have been dealing with a reputable repair center, go there. Otherwise go to the dealer and see what they say. If they recommend the converter, push for the sensor. That way you are only out $250.00! Good Luck!!!

Feb 21, 2009 | 2002 Lexus ES 300

1 Answer

Engine code p0421


Catalyst System Efficiency Below Threshold (Bank 1)

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.

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


To Do list

* 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

Jan 04, 2009 | 2001 Hyundai Sonata

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