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How does a 02 sensor work on the emission - Cars & Trucks

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The O2 sensor measures the fuel/mix after it has been burned. The O2 can tell if the engine is running rich or lean and constantly adjusts the fuel mix to a proper level. As a secondary function, there is usually a pair of O2 sensors before and after the Catalytic converter.

The readings from the first sensor are compared to the readings of the second sensor to rate the efficiency of the Catalytic converter.

Posted on Oct 31, 2012

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Posted on Jan 02, 2017

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I got codes p0455,p1421,p1423,p0141


code P0455......... Evaporative emission system leak detected ( large leak ) check gas cap

code 1451...........secondary air system leak ( bank 2 ) check for vacuum leak

code 1423...........secondary air system leak ( bank 1 ) check for vacuum leak

code 0141...........02 sensor heater circuit ( bank 1, sensor 2 ) replace 02 sensor

Mar 02, 2011 | 1997 BMW 328

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I have a 04 f150 with the 5.4 check engine light is on and it read o2 sensor changed twice still read same problem


you have to figure out what is causing the 02 to activate the light, lean or rich exhaust emissions? what its saying is the sensor is working and it has detected a bad emissions or fuel mix in the exhaust, it is not telling you the 02 is bad, thats what the sensors do they detect faults with temps,knocks,emissions, timing,crank position, fuel air mix,throttle position. so the 02 is detecting something and that something is what needs to be found.

Jan 21, 2011 | Ford F-150 Cars & Trucks

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My 2003 Lincoln Aviator emissions light is on and I failed inspection because of it. How can I pass inspection and fix this emissions problem? The inspection code given to me was PO420???


po420 is catalyst system efficiency below threshold. meaning is--- could be down stream 02 sensors or a bad convertor. try buy replacing down stream sensors, hopefully this may help. ( down stream 02 sensors are between convertor and tailpipe). have a good day !!

Dec 13, 2010 | 2003 Lincoln Aviator

2 Answers

My 1985 Chevy k-10 pickup failed emissions in az at 4.46 on the h 6 on the hydrocarbons and 164.24 on the carbonmonoxide . The aplicable standards are 4.40 on the hcs and 48.0 on the co .what do I need to...


The problem with emissions is there are so many things that can help out a little or a lot, Have you had the car checked for any issues with the exhaust such as 02 sensors, converters, muffler, charcoal canister. Try using a higher octane gas that will burn better, this will create a leaner exhaust and also install plugs that will create a hotter spark to ignite the gas during combustion. Here in SC we don't have the emission laws and it's not used as freq. as other states. Good Luck. By the way. I work for Bosch which makes the 02 sensors and I suggest buying the aftermarket because these are built and made the same but the OEM is 2x's as high if not more.

Aug 16, 2010 | 1985 Chevrolet K1500

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Emissions egr came up on the computer test i replace it now oxygen sensor are coming up its has 4


a defective EGR valve will at time effect 02 sensor functions. But even though you vehicle does have 4 02 sensor. The DTC (diagnostic trouble code) will indicate which 02 sensor is faulty. ask the tech who performed the test on your vehicle to tell you which sensor has malfunctioned. or get the dtc code from him then google the dtc for your vehicle and you will have the answer to your question

Mar 21, 2010 | Ford Windstar Cars & Trucks

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Hi i have changed the bank 1 lambda sensor but the engine management light is back on even after having it reset also the emissions are up at 6% any ideas??? regards mark.


Try replacing the oppise 02 sensor you have a heated 02 sensor thats out, and it is possible the new one is defective or it may have what is called a lazy 02 it does not shift fast enought for the computer.

Nov 21, 2009 | 2007 Mercedes-Benz C230 Sedan

2 Answers

Non-california emission O2 sensor for other 49 states


Probably not. The California car is all together different. Usre the Cal, O2 Sensor.

Nov 11, 2009 | 2000 Toyota Camry Solara

3 Answers

2003 Chevy Silverado 1500 Error Codes


P0135 is a bad 02 sensor
P0442 is a evap problem
P0449 is a vent solenoid

i would check the vent solenoid first its a 4ws fuse under the hood in the fuse box make sure you have power to it you should have power at all times the ground comes from the pcm i think if you fix this everything else will work they are all computer controled

Mar 23, 2009 | 2003 Chevrolet Silverado 1500

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Emission /02 sensor diagnostic system not ready for testing


Hello, Sometimes you have to drive 20, 30 minutes or more before the computer loses the code and resets unless you still have a problem
I hope this was helpful.
CYA, Gator241

Feb 07, 2009 | 1996 Volkswagen Jetta

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