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P0420 code evap system - Cars & Trucks

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This is not an evap code. Read on:
P0420 - Catalyst System Efficiency Below Threshold Bank 1

Possible causes- Three way catalyst converter Bank 1
- Exhaust tube
- Intake air leaks
- Fuel injectors may be faulty
- Fuel injector leaks
- Spark plugs may be faulty
- Improper ignition timing
- Engine Control Module (ECM)
Tech notes The most common cause it the three way catalyst converter Bank 1. Changing just the O2 sensor usually don't repair the problem. If the P0420 code is combined with other codes, try fixing the other codes first.

Posted on Nov 02, 2012

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Posted on Jan 02, 2017

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2007 equinox Error code p0496 & p0420 are both coming up AND my speedometer and gas gauge and temp gauge started going crazy after these codes came up. I have only had this car 10 days.


These codes have nothing to do with instrument cluster !
DTC P0420: Catalyst System Low Efficiency Bank 1 , Catalytic coverter is bad ,
DTC P0496: Evaporative Emission System Flow During Non-Purge
Evap emissions purge solenoid is bad more then likely . Your best bet , take it back to where you got it .

Apr 26, 2017 | Chevrolet Equinox Cars & Trucks

1 Answer

Check the meaning of codes, for p0420 and p0496


P0420 Catalyst efficiency below threshold Bank 1.
P0496 Evap emission high purge flow fault

Mar 22, 2016 | 2010 Buick LaCrosse CXS

1 Answer

Dose this mean computer die?wont start new fuelpump so where do i go from here ? new computer or what


Take it to a ASE certified repair facility ,they'll fix it up ! Don't just replace parts !!!!!

P0171 - is a lean code bank 1 -possible vacuum leak , low fuel pressure , plugged fuel filter ,
P0300 - is a random misfire code which is understandable with a lean code .
P0420 As the code description implies the P0420 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0420 code is combined with other codes, try fixing the other codes first
P0452 - EVAP Control System Pressure Sensor Low Input
P0446 - Evaporative Emission Vent System Performance
P0453 - Fuel Tank Pressure Sensor Circuit High Voltage
P1639 - PCM 5 Volt Reference Voltage Circuit Condition
P1653 - Power Steering Output Circuit Malfunction
P1651 - Fan 1 Relay Control Circuit
If you don't know what your doing take it to a repair shop before you waste your money ! You have a lot of problems here an I don't think the computer is bad , I'd say lack of maintenance ! You need to learn how to test thing's to fix them ! From the five volt reference voltage code , I'd say one of your sensors is shorted internally bring down the ref. voltage circuit causing the no start, but then again the 5volt ref. circuit in the PCM could be the problem . What you need to do is Disconnect all sensors that receive 5volt ref. signal one at a time an see if it will start . If I knew what year vehicle yours is I could tell you what sensors ! MAP, TPS , etc...










Jul 06, 2015 | Oldsmobile Silhouette Cars & Trucks

1 Answer

I have an 02 accord that has the check engine light on. Its got 145000 miles on it. I got it scanned. The codes were p1259 vtec system circuit fault bank 1, p0420 catalyst system efficiency below...


Fix the P1259 code first. Are you using the recommended oil viscosity? If not, change that immediately. Also, check the screen in the Vtec solenoid for sludge buildup. If the variable valve timing isn't working properly, it can cause the P0420. If not fixed soon, that can destroy your cataltytic converter. The P1457 code is less important.

http://ricksfreeautorepairadvice.com/motor-oil-viscosity-warning/

Jul 19, 2017 | 2002 Honda Accord

2 Answers

Fault code P0420


This Code means your Catalytic converter is not working like it should. You may have a problem on Bank 1 or the O2 sensor is giving you false readings. At a minimum you should either replace or have the O2 sensor tested to verify that the Catalytic converter is working properly.

If the O2 sensor is accurately performing its job, then have the engine scoped before replacing the Catalytic converter.

You should have received a defect Code for other components which could foul the Catalytic converter. This is why I recommend getting the engine scoped. If other defects were corrected before you purchased this vehicle, then the Catalytic converter may be able to recover by itself.

The Converter costs so much that you should verify things like low compression on the number 1 bank.

Jan 27, 2012 | 2002 Oldsmobile Silhouette

1 Answer

I have a 1999 chevy malibu its 6 cylinders 3100 engine and i have the codes with me this aare the codes that i need 1.#p0420 2.#p0410 3.#p0305 4.#p0449


P0420 - Catalyst System Low Efficiency
P0410 - Secondary Air Injection (AIR) System
P0305 - Cylinder 5 Misfire Detected
P0449 - Evaporative Emission (EVAP) Vent Solenoid Control Circuit

Sep 05, 2011 | 1999 Chevrolet Malibu

1 Answer

Check engine light on got a diognostic and code P0128, P0420, and P0455 popped up trying to figure out what these codes mean and what I need to fix on my car


P0128 ECT Sensor Below Thermostat Regulating Temperature

P0420 Catalyst System Bank 1 Low Efficiency

P0455 EVAP System Large Leak (0.080") Detected

For the 'P0128' your engine isn't getting up to operating temerature. This could be because of a low coolant level or your thermostat is stuck open. For 'P0420', this indicates your catalyst isn't working as well as it should. If you have a four cylinder, this will be the first cat in the system, if you have a V6, then it will be the one on the driver side. Since this code can also indicate a clogged catalyst, you should get this checked at an exhaust shop. They can do a back pressure test to see if it is clogged. For the 'P0455', this indicates you have a fuel leak from the pressure system in the fuel tank. The EVAP takes fuel from the tank that builds up pressure and stores it in a canister until you start the engine. Then it shunts this fuel into the engine to be burned.

Jan 06, 2011 | 2005 Pontiac Grand Prix

1 Answer

2003 nissan murano with check engine light codes P0420 and P0456


P0420 is Catalyst System Efficiency Below Threshold - Bank 1
and
P0456 is EVAP Control System Very Small Leak (Negative Pressure Check)

Nov 22, 2009 | 2003 Nissan Murano

1 Answer

Having the same problem the other guy described.


First of all, these codes are what are called "Powertrain Trouble Codes' (that's what the "P" means P=Powertrain). TCM Request (Transmission Control Module = TCM). The request was to turn on the 'Check Engine" light.
P0720 - output speed sensor circuit malfunction
P0715 - Input speed sensor (turbin speed) circuit malfunction
P0442 - Evaporative Emission System Leak (Small Leak)
P0455 - Evaporative Emission System Leak (Large Leak)
Check fuel filler cap problems - for Evap Emiss leaks
Replace the pulse generators & have the trans fluid replaced/flushed.
The Main Catalyst System Efficiency Bank 1 Is P0420, not P0442
If you had P0420 code, the catalytic converter is shot... and that's an expensive component.

Oct 06, 2009 | 2001 Hyundai Elantra

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