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FAULT CODE 2022 - JUST REPLACED UP STREAM O2 SENSOR, ENGINE LIGHT CAME ON AGAIN WITH SAME FAULT

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Faults for upstream o2 sensors are usually caused by vacuum system leaks before your mass air flow meter. that type of leak will tell the computer to add more fuel because it is reading more air when you really don't need it look for a rip in you boot from air box or that general area that would be the root issue. hopefully. good luck

Posted on Sep 29, 2009

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2003 chevy aveo #1 O2 sensor


#1 is the up-stream sensor (The O2 sensor located before the Catalytic Convertor). #2 is the down-stream O2 sensor. This sensor is located after the Catalytic Convertor. I hope this helps, let me know if you have other questions concerning this issue. Good luck.

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Engine code 28


Are you sure it is a code 28? I only ask because my book doesn't show a code 28 in regards to this problem. I show codes 25 and 26 that may relate to this problem. But before replacing o2 sensor, there are other probabilities for this code showing up. They would be: Injector or injector circuit, Coolant temp sensor or circuit, Air temp. sensor or circuit, Airflow meter, Cold start injector, ECM (Electronic Control Module- THE BRAIN) Or the o2 sensor of course. Plz save your money before purchasing o2 sensor and check possible related items first.You may find o2 sensor is not at fault. Hope this helps.

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P2097 p2196 p2626


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_________________careucar.com

Apr 23, 2013 | 2008 Hyundai Elantra

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1993 Ford Tauras engine light comes on intermdently @ 45 mph then goes off . What to do for smogging?


that is the code for your down stream o2 sensor . you need to replace that

Nov 12, 2012 | 1993 Ford Taurus

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I have five codes P2237 P2196 P2271 P0030 P0171 and a P2237 pending code on a 2005 elantra.The car runs poorly, bad gas mileage, sluggish with the check engine light on.Are all O2 sensors bad or maybe the...


P2237 P2196 P2271 P0030 P0171

These are all O2 sensor trouble codes, except P0171 which is a fuel trim code,

You have a bad 02 sensor - up stream - Bank 1 Sensor 1.

Replace it, then road test. The engine computer has a 'default' fuel trim it uses when an O2 sensor fails so it can protect the catalytic converter. If this hasn't been going on too long, good chance simply replacing the O2 sensor will remedy your problem.

Feb 06, 2011 | Hyundai Elantra Cars & Trucks

1 Answer

2004 Dodge Stratus Sedan. engine light stays on,


Take the vehicle to any auto parts store that offers to read the fault codes with a scanner for free and find out what that code is. If it shows Upstream or Downstream O2 sensor replace the O2 Sensor. There is a catch, dodge had an issue in the 2000 - 2004. The ECM will show a fault code that indicates the Catalytic converter is faulty. This is actually a faulty Downstream O2 Sensor. If you get a Catalytic converter fault code replace the O2 sensor first if you still have the problem then replace the converter.

Jun 25, 2010 | 2004 Dodge Stratus

2 Answers

1998 Saturn SL2 engine light


Possible Causes
The following are malfunctions that could cause a rich condition:
^ Fuel pressure too high. Perform fuel pressure test.
^ Leaking fuel injector(s). - Perform pressure leak down test.
^ Vacuum leak around the MAP sensor grommet.
^ Oxygen sensor contamination.
^ Restricted exhaust or air intake.
^ Fuel Vapor Canister saturated with fuel.

IMPORTANT:
If the front oxygen reading voltage is above 600 mV and the rear HO2S is above 600 mV all the time, the O2 sensors are probably not
at fault.

Sep 22, 2009 | 1998 Saturn SL

1 Answer

1995 Chrysler Cirrus LXI 2.5l,O2 censor #2 comm fail


The #2 O2 sensor should be found "down stream" from the catalytic converter. When you crawl under the vehicle, follow the exhaust pipe from the engine to the catalytic converter. Right before the converter, you'll see one of the oxygen sensors. (That's number 1.) When you follow just past the catalytic converter, you'll see another one. (That's number 2, the one you're looking for.)

The role of the #2 O2 sensor is to make sure not only that the #1 sensor is actually doing its job of maintaining a 14.7:1 air/fuel ratio governed by the computer, but it's also making sure that the catalytic converter is not only present, but also that it's doing its job as well.

This isn't a very expensive part, it's easy to find, and will require an O2 sensor socket to do the job. Make sure you don't use any grease on the new sensor! It can actually render it unusable and cause your check engine light to come on again.

That reminds me...When you change out your #2 O2 sensor, in order to turn off the Check Engine light, you'll need to take it somewhere such as an auto parts store like Advance Auto Parts, who have a scanner to connect to your car's computer and clear the fault code. Otherwise, your computer will have to count a certain amount of ignition cycles before it determines that all is well with your emissions system.

Good luck, have fun, and I hope this helps! :)

Sep 08, 2009 | 1995 Chrysler Cirrus

2 Answers

I need to know what the definition for fault code


The #2 O2 sensor on the cataylitic convertor,could be caused by a bad sensor or bad convertor.

Jun 22, 2009 | 1998 Jeep Cherokee

2 Answers

Check engine light is on


P0135 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P0136 02 Sensor Circuit Malfunction (Bank I Sensor 2)
check for a blown fuse, if it is blown replace it, if it blows again after engine is started you have either a shorted O2 sensor or the wiring leading to the up stream or down stream sensors.

Apr 22, 2009 | 2001 Chevrolet Metro

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