Question about 1996 Chevrolet C1500

1 Answer

1996 chevrolet p0420 code - 1996 Chevrolet C1500

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Chevrolet Master
  • 17,970 Answers

DTC P0420 - Catalyst System Efficiency Below Threshold (Bank 1)
The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. 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. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

You will likely not notice any drivability problems, although there may be symptoms.

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
******** spark timing
The oxygen sensors in front and behind the converter are reporting too similar of readings

Some suggested steps for troubleshooting a P0420 error code include:
Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
Inspect the downstream heated oxygen sensor (HO2), replace if necessary
Replace the catalytic converter

One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Posted on Feb 10, 2012

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

I have a 2005 Chevy Equinox LS that shows the problem light code P0420. How can I fix this?


Do you know what a catalytic converter is ? P0420 How To Diagnose Bad Catalytic Converter EricTheCarGuy Your best bet , take your vehicle to a qualified repair shop that knows how to diagnose this P0420 code .

Feb 03, 2017 | Chevrolet Equinox Cars & Trucks

1 Answer

Fault codes p0420&p1406


catylist efficiency below threshold ( p0420 ). heres a probable fix. go to http://repairpal.com/obd-code-p0420----- this will tell what may be wrong as not to replace parts that are not bad.

Feb 17, 2010 | 1996 Chevrolet C2500

1 Answer

I am getting a p0420 error code on my 1996 chrysler what is the problem


Catalyst System Efficiency Below Threshold (Bank 1)

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

Jan 13, 2010 | 1996 Chrysler Concorde

1 Answer

1998 olds sillouette p1870 p0420 and p0452 and wont pass emmissions in GA HELP I am broke


i dont know what those codes are right off hand but if i had to guess id say replace your o2 sensor and or your egr.check your mass air flow as well.

Aug 03, 2009 | 1996 Chevrolet Suburban

1 Answer

1999 Honda Odyssey p0420 Error Code


Cat efficentcy. replace the converter.

Jul 07, 2009 | 1996 Chrysler Town & Country

1 Answer

P0420 code 1996 chrysler town n country 3.8 v6


p0420 code is catalytic convertor low efficiency.

Jul 07, 2009 | 1996 Chrysler Town & Country

1 Answer

Error codes: P0420 AND P0446


the p0420 could and usaully is a bad converter.

May 28, 2009 | 1996 Oldsmobile Bravada

2 Answers

P0420 & P0430 codes 99 silverado


codes p0420 and p0430 are both post o2 sensors, the ones after the convertor, both sides if replacing

May 17, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

P0420 code shows


P0420 Catalyst System Efficiency Below Threshold (Bank 1)
You have a worn out catalytic converter.

Apr 17, 2009 | 1996 Saturn SL

1 Answer

I have a 1996 Lexus LX450, engine light came on. The DTC is P0420


With that code you most likely have to replace the catalytic converter.You can try to reset the light but it will come back in time.

Nov 14, 2008 | 1996 Lexus LX 450

Not finding what you are looking for?
1996 Chevrolet C1500 Logo

284 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

yadayada
yadayada

Level 3 Expert

76846 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22246 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6918 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...