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The fault must be cleared using a tester. This is a general answer, as in for many cars...yours may require a manual reset: After correcting the problem, say replacing the Mass sensor, the light will reset but only after the car has the opportunity to run through all it's checks and the computer agrees. This can take a few miles or even several hundred, and sometimes requires a few turn on and offs. Alternatively, if you made a good guess, even checked the code, but didn't fix all the things causing the CEL to go on, it isn't going to go off!

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โˆ™ 2006-04-10 19:54:14
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Q: Why does the check engine light stays on after replacing the egr o2 sensor mass air flow and catalytic converters?
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Is bank1 sensor 1 and 2 are they both upstream?

No Bank 1 is the passenger side of the engine in your Ford Expedition , Bank 2 is the drivers side Sensor 1 for both sides of the engine are before the catalytic converters ( upstream ) Sensor 2 for both sides of the engine are after the catalytic converters ( downstream )


What does bank 2 sensor 2 oxygen sensor do?

It is the downstream sensor on one side of the engine that tells the computer how well the catalytic converters are working.


What would cause the catalytic converters to get cherry red on a 97 f150 with a 4.6 engine?

Mass airflow sensor and or aircharge sensor is bad


How can you tell What is bad the catalytic converter or is it a sensor?

replace sensor,catalytic converters smell like rotten eggs when going bad


What is an o2 sensor in an 1998 xtl 4x4 for explorer do?

The O2 sensors ( 2 of them ) nearest the engine are used to sense the amount of oxygen in the exhaust gasses and send a signal to the PCM that adjusts the air / fuel mixture for the engine . The O2 sensors ( 2 of them ) after the catalytic converters are called catalyst monitors and monitor how well the catalytic converters are performing


Where is bank 2 sensor 2 on a 2003 Chevy Suburban?

Assuming this vehicle has duel exhaust with duel catalytic converters, bank 2 sensor 2 would be the O2 sensor after the passenger side catalytic converter.


Where is 02 sensor on 1996 ford explore upstream?

They should be in the exhaust system close to the engine ( either in the exhaust manifold outlets or the exhaust pipe ) before the exhaust enters the catalytic converters Bank 1 is the passenger side of the engine and sensor 1 is the upstream sensor Bank 2 is the driver side of the engine and sensor 1 is the upstream sensor on that side


Where is the oxygen sensor on a 2009 Dodge Journey?

There are four oxygen sensors. One on each side of the catalytic converters.


How do 02 sensors affect catalytic converters?

The Oxygen (O2) sensors located in the catalytic converters help to keep the vehicle running cleaner. If an oxygen sensor goes bad, the vehicle might start to misfire occasionally. The catalytic converter can become plugged up if the oxygen sensor is not working properly. This could lead to the vehicle not running at all.


Will aftermarket catalytic converters mess up the O2 sensor?

A quality aftermarket catalytic converter will work fine as long as everything else is in good working order.


How many catalytic converters does a 2003 jeep liberty have?

2 is one in left side one on the right ,have 4 oxygen sensor 2 on each side on the catalytic


How do you make 02sensors worke with no converters?

They will still work with no converters. The O2 sensor downstream from the catalytic converter is there to monitor the function of the converter its self. So if you remove the converter, the second sensor will trigger the "check engine" light. The sensors (and the entire engine its self) is not effected, however. The light is basically just telling you the converter is no longer working, which is no surprise if it has been removed.


What does an oxygen sensor do in a 1996 ford explorer?

The oxygen sensors located before ( upstream ) of the catalytic converters are used to " sense " the amount of oxygen in the exhaust to adjust the air / fuel ratio for the engine


Where is bank2 o2 sensor for a 2001 f150?

bank 2 is the drivers side of the engine , and sensor 1 is near the engine before the exhaust passes through the catalytic converter , sensor 2 is after the catalytic converter


Where is bank 2 sensor 1 on a 4 cylinder engine?

Subaru Easy to figure out What cylinder is #1 ? It is in bank # 1 So the Bank two #1 oxygen sensor is in the exhaust pipe on the other side of the engine before the Catalytic converters or where the two pipes join together.


Where is bank 2 sensor 1998 mountaineer v8?

Bank 2 is the drivers side of the engine in your Mercury Mountaineer Sensor 1 is between the engine and the catalytic converter ( upstream ) Sensor 2 is after the catalytic converter ( downstream )


Where is o2 sensor bank 1 sensor 1 on a 1999 Dodge Ram 1500?

It is screwed into the front of the catalytic converter on the passenger side of the engine.It is screwed into the front of the catalytic converter on the passenger side of the engine.


Where is the oxygen sensor located on your 1999 Subaru legacy outback sport utility sedan?

I just purchased new catalytic converters for my 1999 Subaru Legacy Outback. There are three ports for oxygen sensors. They appear to be on the top of the converters. I just purchased new catalytic converters for my 1999 Subaru Legacy Outback. There are three ports for oxygen sensors. They appear to be on the top of the converters.


Where are the O2 sensors located for a 2003 GMC Sierra 1500 4WD 5.3l?

There are four oxygen sensors for this vehicle - two for each bank of cylinders. They are located on the exhaust pipes just ahead of and after the catalytic converters - sometimes referred to as "upstream" and "downstream" of the catalytic converters. Bank 1 refers to the bank of cylinders where cylinder number is located, which is the left or driver's sidde. Sensor 1 is located ahead of (closer to the engine) the catalytic converter. Sensor 2 is located after the converter. The same goes for bank 2.


On a 1997 ford explorerWhich oxygen sensor is bank 1?

Bank 1 is the passenger side of the engine Sensor 1 is near the engine before the exhaust enters the catalytic converter Sensor 2 is after the exhaust leaves the catalytic converter


How many 0 2 sensors are in a 1997 Ford Expedition Eddie baur?

I believe there are ( 4 ) Bank 1 is the passenger side of the engine , sensor 1 is before the catalytic converter ( upstream ) and sensor 2 is after the catalytic converter ( downstream ) Bank 2 is the driver side of the engine , sensor 1 is before the catalytic converter ( upstream ) and sensor 2 is after the catalytic converter ( downstream ) The 2 sensors before the catalytic converter are used for air / fuel ratio for the engine The 2 sensors after the catalytic converter are called catalyst monitors


Is the 2 oxygen sensor on a 2005 Ford F-150 located on the passenger or drivers side of the engine?

BANK # 1 is the passenger side of the engine / BANK #1 SENSOR # 1 is in the exhaust before the catalytic converter / BANK # 1 SENSOR # 2 is after the catalytic converter ( downstream ) ------------------------------------------------------------------------------------------------------------ BANK # 2 is the drivers side of the engine / BANK # 2 SENSOR # 1 is in the exhaust before the catalytic converter / BANK # 2 SENSOR # 2 is after the catalytic converter ( downstream )


Check Engine Light came on in your 2002 Nissan Sentra mechanic checked code said it was an oxygen sensor had it replaced 3 times light keeps coming on What should you do?

It might be the catalytic converters. My 2002 had the check engine light on and it was a bad cat.


Where is the oxygen sensor on a 2002 mercury villager?

There are two, on in front of the converters near the engine, and one after the converters, roughly under the passenger seat.


How do you change the oxygen sensor in a 2000 crown Victoria?

Well depending on which sensor you need to change there will be 2 sensors on each side. They would be located on the exhaust right by the catalytic converters. sensor 1 will be the closest to the engine sensor 2 will be closest to the catalytic converter. You will need and 11/16 box wrench and a jack or a car lift to do the job. Bank 1 is on the driver side bank 2 is on the passenger side.