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I have a 2005 cobalt and I got a check engine light on so I took it to find out the code p0420. what would be the problem or how can I fix it?

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Would replace the catalytic converter

if the substance inside the catalytic converter is broken or failed, it may be restricting the exhaust which will result in a feeling of reduced power output from the vehicle.

Posted on Apr 30, 2017

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1 Answer

My 2005 chevy equinox keeps showing problem code P0420 How do I fix this problem?


0 2 sensor near the catalytic converter or

replace the catalytic converter

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.

Read more at: https://www.obd-codes.com/p0420
Copyright OBD-Codes.com

https://www.obd-codes.com/p0420

Feb 03, 2017 | Cars & Trucks

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P0420 p0522 chrysler pacifica CODES


thje po420 need to monitor o2 sensors to verify if you have a bad sensor or bad catalitic converter
the po522 oil presure sending unit

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1 Answer

2006 chevy cobalt(85000 miles) check engine light comes on and stays on. I am getting the check engine light code p0420. Engine seems to be running smoothly.


http://www.obd-codes.com/p0420

TSB Number: 3316 NHTSA Number: 10017210 TSB Date: n/a Date Added to File: October 27, 2005 Failing Component:Electrical System Summary:Diagnostic trouble code P0420 may set on low mileage vehicles, or shortly after catalytic converter replacement
TSB Number: 3316 NHTSA Number: 10017210 TSB Date: n/a Date Added to File: October 27, 2005 Failing Component:Electrical System Summary:Diagnostic trouble code P0420 may set on low mileage vehicles, or shortly after catalytic converter replacement
there is a service bulletin for this.

http://www-odi.nhtsa.dot.gov/cars/problems/tsb/results.cfm?start=1&SearchType=DrillDown&type=VEHICLE&year=2005&make=CHEVROLET&model=COBALT&vehtype=PC&typenum=1&component_id=0&summary=true

Aug 02, 2011 | 2006 Chevrolet Cobalt

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The vsc light and the trac off light and check engine light all came on at the same time code p0420 comes up on my 2005 highlander what does this mean?


A p0420 sets after Engine and catalyst are warmed up, vehicle driven within set vehicle engine speed range and waveforms of heated O2 sensors bank 1 sensor 1 and bank 1 sensor 2 have the same amplitude.
Catalytic convertor and O2 sensors need to be tested

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My 2005 chevy cobalt is idleing iregular when i stop or sometimes stalls out at stops my check engine light came on but after sitting for 10 hours and starting back up went off about ten minutes into my...


Had the same problem with mine. Check and clean your throttle body, as well as all hoses leading from you air filter all the way to the engine. Took a bottle of carb cleaner, a rag, and some q-tips.

Nov 22, 2010 | 2005 Chevrolet Cobalt

1 Answer

My daughters 2005 cobalt had a shift selector problem (spilled soda in it). The problem was fixed and it now allows her to turn the key completely off but now she has a check engine light on. What is...


It may be coincidental or maybe not. You will have to put a diagnostic reader to find what the check engine light problem is. This usually will give the problem from a code selection.

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2005 chevy cobalt, car wont start ... check


disconecting the battery should reset the pcm. but you will need to find out what caused the problems.

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2 Answers

Check engine light - P0420 code


Causes 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
Robert

Please rate this solution thanks

Feb 02, 2009 | 2005 Toyota Corolla

1 Answer

PO406 Code


I have 2005 Dodge Caravan SE 2.4cc and the code is P0420 I need now what is the exactly problem. all ways when I try to stop the engine turn off or almost turn off.

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