Question about 2007 Ford Mustang GT California Special Convertible

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Po420 bank 1 and po430 bank 2 error codes

Po420 bank 1 and po430 bank 2 error codes caused a failed inspection

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Sounds like O2 sensors to me. I havent changed one on a mustang yet but I havent had any trouble with any others that I have done, they screw in like a spark plug but you will need a special tool, I hope this helps you.

Posted on May 13, 2010

  • terry conrad
    terry conrad Feb 28, 2014

    do u know what codes po420 p1000

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Can catalytic converter cause a PO65O code


Pesky PO420 Codes - Eastern Catalytic

www.easterncatalytic.com/education/tech-tips/pesky-p0420-codes/
One of the most annoying is the persistent PO420 diagnostic code (Catalyst System ... not only shows its teeth when the catalytic converter is on the blink, but can also be ... Most, if not all, catalytic converter failures are caused by a problem or ...

P0420 Error Code: Catalyst System Efficiency Below ...

www.obd-codes.com/p0420
Repair information for the OBD-II trouble code P0420 - Catalyst System Efficiency ... If they have failed, it is likely due to something else that caused it to fail. ... the catalytic converter is broken or failed, it may be restricting the exhaust which will ...

explaining trouble codes po420 - po421 - Discount Catalytic ...


Jan 16, 2016 | Cars & Trucks

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Trk won't pass inspection. It has the code PO420. catalys system below efficieny.


My father's 99 Suburban had a similar code for Bank 2(passenger side).Change the O2 sensors before and after the catalytic converter for the driver's side(cylinders 1-3-5-7).All four sensors are in the front section of the exhaust,just follow the pipe from the driver's side manifold to find the correct sensors.

Dec 08, 2012 | 1999 Chevrolet Silverado 1500

2 Answers

What does the codes p0442,p0136 &p0141 mean on my 2001 ford taurus it failed inspection for these codes


P0442 FORD - Evaporative Emission System Leak Detected Small Leak

Possible causes- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking
P0136 - O2 Sensor Circuit Malfunction Bank 1 Sensor 2
Possible causes- Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Faulty Rear Heated Oxygen Sensor Bank 1
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks

P0141 FORD - O2 Heater Circuit Bank 1 Sensor 2

Possible causes- Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit fuse
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit open shorted to ground
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit poor electrical connection
- Faulty Engine Control Module (ECM)

Sep 27, 2012 | 2001 Ford Taurus

1 Answer

Code of PO174 1 system too lean (bank 1) Code PO420 Catalyst efficiency below threshold (bank 1) Code PO430 Catalyst efficiency below threshold (bank 2)


hi,my friend, you can try,

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

Sep 14, 2011 | 2003 GMC Yukon XL

1 Answer

2001 santafe with error cod PO420


CODE PO420 - CATALYST EFFICIENCY BELOW THRESHOLD BANK 1. POSSIBLE CAUSES, AIR LEAKS AT THE EXHAUST MANIFOLD OR IN THE EXHAUST PIPES, BASE ENGINE PROBLEM HIGH ENGINE OIL OR COOLANT USAGE, CATALYTIC CONVERTER IS DAMAGED CONTAMINATED OR HAS FAILED, CONTINUOS ENGINE MISFIRE CONDITIONS OR WEAK LOW COIL OUT PUT, FRONT HO2S OR REAR HO2S IS CONTAMINATED WITH FUEL OR MOISTURE, REAR HO2S IS LOOSE IN THE MOUNTING HOLE CHECK IT FOR A LEAK.

Aug 16, 2011 | Hyundai Santa Fe Cars & Trucks

1 Answer

What does code po420


P0420 Error Code: Catalyst System Efficiency Below Threshold (Bank 1)\
This means that your bank 1 catalytic converter is not doing its job, or the O2 sensor system monitoring it has an issue.

May 09, 2011 | 2000 Cadillac DeVille

1 Answer

2 codes 1) P0420 catalytic converter system below threshold (bank 1) 2) P0420(Pd) catalytic converter below threshold (bank 1)


possible causes for code po420 airleaks at the exhaust manifold or in the exhaust pipes,base engine problems high engine oil or coolant usage,catalytic converter is damaged contaminated or has failed,continuos engine misfire conditions or weak or low coil out put,front HO2s or rear HO2s is contaminated with fuel or moisture,rear HO2s is loose in the mounting hole,front HO2s older aged than the rear HO2s or HO2s 1 - 2 is lazy.

Mar 31, 2011 | Chevrolet Equinox Cars & Trucks

3 Answers

Po420 code monte carlo ls 2001


PO420 code is for catalyst system efficiency below threshold (bank 1) Usually it means that it is time for a new catalytic converter on bank number 1. Cylinder bank number 1 is always the bank with the number 1 spark plug in it.

Apr 20, 2010 | 2001 Chevrolet Monte Carlo

1 Answer

What is this code po420 bank 1 in a che?vy monte


I could go on and on about Po420 code but it's easyer to tell you to go to www.po420.com and everything you want to know and then some is there. Let me know if this was helpfull..4 thumbs up !

Feb 24, 2010 | 2002 Chevrolet Monte Carlo

1 Answer

My car got a po420 code reading when i went to get it inspected. whats that mean


The PO420 means that the Catalyst System has an Issue'

The actual error is

"Catalyst system below Threshold (bank 1)"

As mentioned above, the code's description is Catalyst System Efficiency Below Threshold (Bank 1). OK, now tell me that again in plain English please.... let's break it down: the catalyst system being referred to is your three-way catalytic converter; so the catalytic converter is not working properly (i.e. it's not efficient). Bank 1 refers to the side of the engine which contains cylinder #1. On inline engines such as 4 & 5 cylinder engines, there is only one bank. So, to really simply things let's just say that the efficiency of the catalytic converter and/or exhaust pipe and/or O2 sensor is not so great.

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.

You can search for the Information on the web. Just type in the actual error above into you fav search engine!

Hope that helps...

Dec 28, 2009 | 2004 Nissan Altima

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