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What are the probable causes of recurrent DTC P0420?

Replaced the cc and the sensor still get a bank 1 code 0420??

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6ya6ya
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Posted on Jan 02, 2017

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digritz
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SOURCE: PO135 Error Code

Bank one stands for the same side as the number 1 cylinder. Sensor 1 is the first sensor in the bank, (closest to the engine or upstream).
In most cases you will find it on the drivers side\left hand side of the engine and above the catalytic converter. Look for it on the lower portion of the exhaust manifold.

Posted on Sep 07, 2009

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Lloyd Six
  • 560 Answers

SOURCE: OBD II code P0133 (O2 bank 1 sensor 1) which

It is the front sensor, if your car is the type that has 2 front sensors it will be the one closest to the timing chain / belt (left hand side of engine)

Posted on Nov 27, 2009

countrybo331
  • 79 Answers

SOURCE: A P0031 DTC (diagnostic trouble code) refers to

your bank 1 sensor is on your driver side..if you get up under the car and see were your exhast pipes come from the engine you will see it all u have to do is disconect the wire connector and its either a 21mm or a 18mm wrench to take it off.....if you need any other info or a picture of it just let me know

Posted on Mar 28, 2010

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  • 2428 Answers

SOURCE: 2002 Suzuki XL7 2.7

Itsone one cloest to the front of the vehicle thats how there counted

Posted on Dec 05, 2010

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1 Answer

New exhaust no cst converters chanch sensors twice problem stay p0420


you will need a cat converter to make the system work properly
code p 0420 refers to cat converter system bank 1-efficiency below threshold===causes ---cat converter, ---wiring---HO2S 2 sensor
have you been replacing the correct sensor as they are different in operation

Sep 30, 2015 | 2009 Chevrolet Lumina SS

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On the 2004 honda crv along with code 1259vtec, l also have code 0420 which deal with the oxygen. If I upgrade the gas and put in lucas fuel injection cleaner, is it possible to correct the condition


NO--- code p0420 refers to the catalic converter system, bank 1 --efficiency below threshold===causes --cat converter, wiring-HO2S sensor 2
code p1159 refers to heated oxygen sensor (HO2S) -front circuit low voltage positive terminal===causes--wiring--HO2S--ECM programming---ECm

In both codes the heated oxygen sensor is mentioned so I would have it replaced before I spent money on a cat converter.

Feb 09, 2015 | 2004 Honda CR-V

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Dakota p0171 p0174 taurus


code p0171 refers to system to lean bank 1==causes intake /exhaust leak--AIR system--MAP/MAF sensor--fuel pressure/pump--injectors--HO2s Have a fuel pressure test done on the fuel manifold to check for blocked filter/faulty pump/fuel pressure regulator faults
code p0174 refers to system to lean bank 2 --same causes including hose connection/s
code p0420 refers to catalytic converter system -bank 1 efficiency below threshold==causes catalytic converter--wiring--HO23. Check the cat converter is not cracked inside and the oxygen sensor is working.

Sep 06, 2013 | 2009 Citroen C8 2.0

1 Answer

DTC P0420 what is it?


P0420 CHRYSLER - Catalyst System Efficiency Bank 1 Low
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 is worn out. Changing just the O2 sensor/Catalytic efficiency monitor usually doesn't repair the problem. If the P0420 code is combined with other codes, try fixing the other codes first.

Oct 09, 2012 | 2003 Chrysler Town & Country

1 Answer

P0430 code


Hi there:

DTC P0420 - Catalyst System Efficiency Below Threshold (Bank 1)
DTC P0430 - Catalyst System Efficiency Below Threshold (Bank 2)

Could be some electrical problem, check wires and harnesses connections (cleaning job); also check description and testing HERE.

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Thank you for using FixYa, have a nice day.

Sep 14, 2012 | 2005 Kia Sportage

1 Answer

2001 express p0420 p0174 engine codes , help diagnose !


0174 is system too lean, right bank. 0420 is catalyst sytem efficiency below threshold, left bank. fix would be either oxygen sensor or catalytic converter replacement possibly would need both. note: this veh would possibly have up to 4 oxygen sensors, but cause of problem would be the ones coming off manifolds before the catalytic converter possibly in manifold or y-pipe/down pipe.

Aug 27, 2012 | 1997 Chevrolet Cargo Van

1 Answer

0420 AND CHECK ENGINE LIGHT STAYS ON


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.

Feb 17, 2012 | 2000 Toyota 4Runner

3 Answers

Diagnostic trouble codes dtc po420 po102


CODE PO102 IS MAF SENSOR CIRCUIT LOW FREQUENCY CONDITIONS / CODE PO420 IS CATALYST SYSTEM LOW EFFICIENCY BANK 1 CONDITIONS. BAD MASS AIR FLOW SENSOR WILL AFFECT CONTAMINATE DAMAGE CATALYTIC CONVERTER DUE TO RICH EXHAUST EMISSIONS.

Jan 26, 2011 | 1997 GMC Jimmy

1 Answer

Check engine code 0420


catalyst below threshold (bank 1) p0420- There are a number of things that could be causing this p0420 catalyst efficiency code. The most common thing is the catalytic converter itself is no longer functioning properly. The other likely thing is the rear O2 (oxygen) sensor is no longer working properly. Other things could include exhaust leaks, damaged exhaust pipes, damaged O2 sensor wiring/connectors, plugged catalytic converter, etc

May 23, 2010 | 2002 Pontiac Grand Prix

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