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Electrical code P0420 for Subaru outback - 2000 Subaru Outback

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P0420....Catalyst System Efficiency Below Threshold (Bank 1)

Posted on Aug 29, 2010

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Posted on Jan 02, 2017

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SOURCE: Check engine light on. P0325, P0420 2000 Subaru

CODE PO420 CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD BANK I * CODE PO325 KNOCK SENSOR NO.1 CIRCUIT MALFUNCTION BANK NO.1 OR SINGLE SENSOR

Posted on Nov 14, 2009

  • 121 Answers

SOURCE: 2000 Subaru legacy outback 2.5L DTC P0420 code

that code is saying you have a problem with that system. if you go to autozone thay can print that code out for that tells you what to check. other then that you may need to get it diagnosed by a professional

Posted on Nov 23, 2009

  • 58 Answers

SOURCE: 1996 Subaru Outback Engine Code P0170

P0170 Fuel Trim Malfunction (Bank 1), could be fuel filter, mass air sensor, or low fuel pressure.

Posted on Jan 02, 2010

Rebgagnon
  • 382 Answers

SOURCE: 2000 Subaru Outback Wagon (100K miles) with P0420 Code

I do not know for sure if this is the problem you are having, But, I have noticed that from 95 up to 2002 I have seen a lot of PO420 codes that have been just the sensor. I do not know if it was a weak sensor or just that program telling it that it is below threshold. I did notice that if the vehicles are run for a long trip at highway speed it goes out. I wish you luck and have a great day.

Posted on Feb 11, 2010

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1 Answer

Error code P1446 on a 2002 Subaru Outback


P1446 Subaru
P1446 Subaru - Fuel Tank Sensor Control Valve Circuit Low

Possible causes
- Faulty Fuel Tank Sensor Control Valve
- Fuel Tank Sensor Control Valve harness is open or shorted
- Fuel Tank Sensor Control Valve circuit poor electrical connection

Read more: http://engine-codes.com/p1446_subaru.html#ixzz3XW7JPocn

Feb 17, 2013 | 2002 Subaru Outback

1 Answer

2002 Outback P0420


The code is a popular one which means the catalytic converter is not up to its best performance. The computer uses the front and rear O2 sensors to monitor the activity of the converter.
The problem could be the converter, one of the sensors, or something in the engine.

Aug 20, 2012 | 2002 Subaru Outback

3 Answers

Computer diagnosis P0420


P0420 SUBARU - Catalyst System Efficiency Below Thresholdxicon.jpghttp://engine-codes.com/p0420_subaru.htmlForum CodePossible 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 is the three way catalytic converter Bank 1 is worn out. Changing just the catalyst O2 sensor usually does not repair the problem. If the P0420 code is combined with other codes, try fixing the other codes first.

Aug 20, 2012 | 2002 Subaru Outback

1 Answer

I have "Subaru Outback" 2008. "Check Engine"is on


P0420 Usually indicates a bad catalytic converter or a bad oxygen sensor. Since you car is 2008 my money is on the oxygen sensor. Or it could be something as simple as an exhaust leak. The cruise control will keep flashing until you get the CEL fixed

Oct 25, 2011 | 2008 Subaru Outback

1 Answer

Check engine light comes on every 200 or so miles, code P0420. O2 sensor has been replaced. I read that there was a bad batch of catalytic converters in this model. Any other easy tests or fixes?


p0420 is set when the convertor is unable to store oxygen in the minerals used in the convertor. the lack of oxygen to mix with the exhaust gases causes the O2 sensor to set the code. if the O2 sensor has been replaced the only other thing to do is replace the convertor. you can check with the Subaru dealer and let them run your VIN to see if you had one of the defective convertors.

Aug 01, 2011 | 2001 Subaru Outback

1 Answer

2000 Subaru Outback Wagon (100K miles) with P0420 Code


I do not know for sure if this is the problem you are having, But, I have noticed that from 95 up to 2002 I have seen a lot of PO420 codes that have been just the sensor. I do not know if it was a weak sensor or just that program telling it that it is below threshold. I did notice that if the vehicles are run for a long trip at highway speed it goes out. I wish you luck and have a great day.

Jan 12, 2010 | 2000 Subaru Outback

1 Answer

2000 Subaru legacy outback 2.5L DTC P0420 code will not clear. I replaced the rear O2 sensor and the CEL is still on. I used the scan tool to clear the code but it will not clear.


that code is saying you have a problem with that system. if you go to autozone thay can print that code out for that tells you what to check. other then that you may need to get it diagnosed by a professional

Nov 22, 2009 | 2000 Subaru Outback

2 Answers

Check engine light on. P0325, P0420 2000 Subaru


CODE PO420 CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD BANK I * CODE PO325 KNOCK SENSOR NO.1 CIRCUIT MALFUNCTION BANK NO.1 OR SINGLE SENSOR

Nov 13, 2009 | 2000 Subaru Outback

1 Answer

P0420 and check engine light


A p0420 code is set when the computer determines that the catalytic converter isn't doing it's job. In almost all instances that code can't set as a result of a bad o2 sensor so they probably didn't have to be replaced. The catalytic converter will need to be replaced, prefferably by an oem part. This can be pretty expensive and should be considered before purchasing the vehicle.

I have replaced a few bad converters on late model subarus in the past few years.

Apr 18, 2009 | 2003 Subaru Outback

2 Answers

Engine light came on. The dealership said it was diagnostic code P0420 and that it would cost @ $1,200.00 to repair. This seem pretty high. What is this diagnostic code about and is the repair rate


Hi, this code represents a Catalyst System Efficiency Below Threshold (Bank 1). and the repair, considering that it will be repaired by the dealership, seems to be in the normal cost range. The labor is what usually inflates the price when dealing with catalytic replacements.

You could probably get a better deal by taking it to a non dealership type of repair shop. This may cut at least 200 dollars of the original dealership quote.

Please rate and god bless:)

Apr 14, 2009 | 2005 Subaru Outback

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