Question about 1997 Saturn SL

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High RPM The trouble code is 0420. Catalyst Below Efficiency. Need to fix to pass inspection. Any suggestions?

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  • mike loshbough
    mike loshbough May 11, 2010

    replace converter

  • Anonymous Mar 29, 2014

    I have a isuzu accender 2003 that won pass 3 rpm I swap the catalyst

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  • 132 Answers

Replace catilytic converter

Posted on Feb 20, 2009


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What means catalyst Efficiency below normal


      Got it scanned and it's P0420: Catalyst efficiency below thresholdbank 1. They said it could be a bad catalytic converter or oxygen sensor. I borrowed a scanner and tried to measure the oxygen sensor readings over time.Sep 8, 2011

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    P0420 Error Code: Catalyst System Efficiency Below ...

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Jan 26, 2016 | Cars & Trucks

1 Answer

Trouble shooting code p0422


P0422--Main Catalyst Efficiency Below Threshold (Bank 1)

Worn out Exhaust Converter

They need to be replaced at 12 to 14 years,
even if they pass inspection,at that point they
no longer are doing much

You can get any codes you want by using google
& entering OBD2 Codes & your codes & can include
your veh & year in case you get euro,asian or domestic
conflict on a code

Nov 17, 2012 | 1996 Audi A6

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

I have a engine light Code P 0420, please tell me how to fix this & what is this. Its 2000 Honda Civic Ex $ door Sedan


Your Honda is probably very high on mileage. The P0420 code indicates that the catalyst system is operating below the efficiency threshold. In English, your sensors are telling your ECU that the catalyst in the catalytic converter is worn out. A new catalytic converter is going to be big $$$.

It is not going to disable your car, but if you live in a state requiring emission testing to pass inspection, your car will probably not pass the next inspection.

You can get a code reader (the Actron CP9575 or CP9175; both work well for less than $150.00 USD) from most auto parts stores or Sears and try clearing the code. In all liklihood, clearing the code this way will not fix the problem and the CEL will illuminate again.

Jul 21, 2010 | 2000 Honda Civic

1 Answer

Radiator fans fuses keep blowing-chevy impala 2002. we need info on following codes: P0108, P0128, P 0341, P 0401, P 0420, P 1480, and P 1481. John


p0108 map curcuit high input, p0128 coolant temperature below thermstat regulating tempurature, p0341 is camshaft position sensor A-bank 1 ckt range/performance, p0401 is exhaust gas recirculation, insufficiant flow detected, p0420 is catalyst system efficiency below threshold, p1480 is manufacturer control auxilary emission controls, p1481 is same as p1480.

Jun 15, 2010 | 2002 Chevrolet Impala

1 Answer

Loses power after 15 minutes. sits for 15 minutes and then runs f


Silly question

You got the code PO-420 Catalyst System Efficiency Below Threshold (Bank 1)

That is the converter,don't these places people go to ,tell you what codes they pulled?

O2 Sensors
Coolant Temp Sensor
High Fuel Pressure
Bad Converter
Cylinder Misfire
Damaged Exhaust System Pipe/Muffler
High Oil Consumption
Etc, Etc

May 26, 2010 | 2001 Honda Civic

1 Answer

Main catalyst efficiency below threshold bank 2 cherokee 2001


If the readings were close to passing, use 3oz of acetone per 10 gals of fuel and it should pass. Then you have a whole year to figure out what's wrong with it! Main cat is the large one. all others are pre-cats.

Jun 09, 2009 | 2001 Jeep Cherokee

1 Answer

1996 SATURN P0420 CODE


ok knowing the code is what its all about..- code 0420 is
"Catalyst efficiency below threshold"
This indicates that the oxgygen sensor downstream from the cat is sensing high levels of oxygen after the cat. The catalyst is supposed to use all the oxygen to catalyse the nasty **** in your exhaust. A high level downstream from the cat indicates either the cat needs to be replace (MOST LIKELY) or you have a faulty sensor.
A faulty sensor would bring up other codes on your scan too, so I am afraid a new Catalyst is likely the fix. They last about 120-150K miles so if you're in that range there ya go....
hope that gets it for you...pls rate me if you get a mo.

Jan 10, 2009 | 1996 Saturn SL

2 Answers

Catalyst Efficiency Below Threshold (Bank One)


what is catalyst efficiency below threshold ( bank 1 ) mean?

Dec 12, 2008 | 2005 Nissan Maxima

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