Question about 1996 Oldsmobile Bravada

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Error codes: P0420 AND P0446

1996 Oldsmobile Bravada 4.3 liter. Error code: P0420 and will not pass emissions. Also code: P0446, I realize that the P0420 may be a 02 sensor, but I am looking for anyone that may be more specific on either one of these two error codes. Thank you in advance.

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The p0420 could and usaully is a bad converter.

Posted on May 28, 2009

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I have two codes come up when checking why my check engine light is on. P0447 and P0420. Any info on what these mean and what it takes to fix so I can pass my smog test??


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Definition of P0420 is catalyst below threshold. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). Catalytic converters are not normally a "wear" type item, that is they are not deisgned to wear out and need replacement. If they have failed, it is likely due to something else that caused it to fail.

P0447 Evaporative Emission Control System Vent Valve/Solenoid Circuit Open. The Powertrain Control Module (PCM) has detected an open within the circuit that controls the vent valve or solenoid for evaporative emission systems vapor.

Read more at: http://www.obd-codes.com/p0447
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Jan 26, 2016 | Hyundai Motor 2002 Elantra

1 Answer

How do I pass emissions with my 1997 does explorer XLT P0


The recommended repair for both the P0171 and P0174 codes is to clean the MAF sensor. Ensure you use the proper cleaning solution, as there are many that will damage the sensor. Buy a cleaner that is made specifically for MAF sensors. The P0420 code will probably clear up if the MAF sensor clears the other two codes.

Nov 13, 2015 | 1997 Ford Explorer AWD

1 Answer

Code P0420 on 2001 Olds Bravada


  • Inefficient Catalytic Converter(s)
  • Defective Front or Rear Oxygen Sensor(s)
  • Misfiring engines

Jan 19, 2015 | 2001 Oldsmobile Bravada

1 Answer

Code PO452 for 1998 bravada


code p0452 is evaporative emission system pressure sensor/switch low.

Jul 31, 2012 | 1998 Oldsmobile Bravada

1 Answer

2004 Dodge Ram P0420 code. What could be causing this? My emissions are clean (all were within limits), and I just replaced all 4 oxygen sensors


This code is set when the catalytic converters are operating below tolerable efficiency limits. Basically, your catalytic converters are bad and are in need of replacement. You can have bad converters and still pass emissions, but your computer uses the oxygen sensors to determine how well they are working. If the readings are out of a set tolerance, the check engine light will illuminate and DTC P0420 will set. Clearing the code will turn the light out temporarily, but the next time the test is run, the light will come on again.
Hope this helps.

Oct 20, 2010 | 2004 Dodge Ram 1500

1 Answer

2001 Honda - New Catalytics & O2 sensors -- new 0420/1739/1456


I would send the car for a smoke test for the emissions leak...Find out where the leak is comming from..Repair it..Reset the codes, then do a drive cycle and see what happens...

Jun 29, 2009 | 2001 Honda Odyssey

1 Answer

2000 camry LE 4cyl...p0420


The code PO420 you have is Catalyst System efficiency is below threshold bank one. Usually replacing the O2 sensor that's the front most in the exhaust system will cure your problem,

Your Check Engine light is on and you find a P0420 code for a catalytic converter fault. Does that really mean your converter has reached the end of the road and needs to be replaced? A new converter can cost $600 to $1000 or more if a new car dealer or repair shop does the job, or maybe half that amount if you do it yourself. It's an expensive fix that may or may not be necessary. The problem, in most cases, is an emissions issue, not a performance issue that affects the way the engine runs.

A P0420 diagnostic trouble code is a "generic" fault code that is set when the Onboard Diagnostic II (OBD II) system sees a drop in converter efficiency. The OBD II system monitors catalyst efficiency by comparing the switching activity of the upstream and downstream oxygen sensors in the exhaust. The upstream O2 sensor in theexhaust manifold reflects the condition of the exhaust gases as they exit the engine. The downstream O2 sensor in or behind the catalytic converter reflects the condition of the exhaust after it passes through he converter.

The catalytic converter is like an after-burner. It oxidizes (burns) any residual fuel vapors (unburned hydrocarbons or HC) in the exhaust. It also burns any carbon monoxide (CO) in the exhaust. The exhaust must meet federal emission standards, and if a problem exists that causes emissions to exceed the federal limits by 150%, the OBD II system is supposed to catch the fault, set a code and turn on the Check Engine light.

Thanks

Apr 26, 2009 | 2000 Toyota Camry

1 Answer

Is there a Pass Code for a 2000 Oldsmobile Bravada?


Key on 5 minutes, off 5 secs. Fire it up, easy as that.

Dec 18, 2008 | 2000 Oldsmobile Bravada

1 Answer

02 Bravada Engine Light On


goto the following link. Hope it will be of some help for you.

http://montreal.sae.org/congress/2001/showmon.pdf

Sep 15, 2008 | 2002 Oldsmobile Bravada

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