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Old 04-14-2016, 11:02 AM   #1
crzyalbo
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2008 Astra XR
Default P0420 Power Catalyst System Efficiency below threshold (Bank 1)

Has anyone had this code before and if so, what is the best way to resolve it. Will changing the Oxygen sensors resolve the issue or is the Cat gone at this stage.

BTW: Power is strong with no apparent performance issues at this time.

Last edited by crzyalbo; 04-14-2016 at 11:06 AM.. Reason: more clarification

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Old 04-14-2016, 11:28 AM   #2
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Default Re: P0420 Power Catalyst System Efficiency below threshold (Bank 1)

homework:
https://cse.google.com/cse?cx=partne...=P0420%20astra

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Old 04-14-2016, 01:32 PM   #3
crzyalbo
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Default Re: P0420 Power Catalyst System Efficiency below threshold (Bank 1)

Sorry. Jumped the gun without doing my due diligence. Lots of good info on the links provided.

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Old 04-14-2016, 03:01 PM   #4
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Default Re: P0420 Power Catalyst System Efficiency below threshold (Bank 1)

From the service manual;

Probable Causes:
1-Sensor or solenoid faulty
2-Connector terminal contact is damaged or corroded
3-Wire harness - Check harness for correct voltage, open, short to ground or short to voltage
4-Update control unit software - Check for the latest control unit update
5-Powertrain or Engine Control Module faulty
6-HO2S sensor contamination/damaged
7-Exhaust leaks or restrictions
8-Catalytic converter damage
9-Catalytic converter improper operation


Cross off 4 and 5, leaving the rest as most likely possibilities. Mileage can help determine whether or not a catalytic converter is worn out besides an obvious exhaust restriction making the engine run strange; no power until the precat O2 sensor is removed to provide an alternate exhaust hole.

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Old 04-17-2016, 01:18 PM   #5
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Default Re: P0420 Power Catalyst System Efficiency below threshold (Bank 1)

Check your flex connector in the exhaust system (just back of the engine). Chances are that is has a hole in it (somewhat common problem). It's a cheap fix (probably about $100-$150) to have an exhaust shop weld on a new one.

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Old 12-14-2016, 11:18 PM   #6
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Default Re: P0420 Power Catalyst System Efficiency below threshold (Bank 1)

Check for leaks and o2 sensors. More than likely a bad cat. If you dont want to pay an arm and leg to clear the code if it is the cat, use a spark plug fouler on the downstream sensor. It will make the reading and voltage more stable and fool the computer even with no cat.

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Old 12-15-2016, 09:22 AM   #7
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Default Re: P0420 Power Catalyst System Efficiency below threshold (Bank 1)

Check for any exhaust leaks as this could contribute to the problem. But I suspect you have a bad cat and / or downstream O2 sensor.

You might try the de-fouler trick before getting serious about a cat converter

I added defoulers to mine AND a new O2 sensor because I couldn't get the old one out without destroying it. So I can't say for sure the de-foulers solved it, or the O2 sensor solved it. But I didn't need to replace the Cat converter.

no more P0420 code. I would recommend NOT clearing the codes. Do the mods and then if the problem is solved, the code will clear itself.

http://www.saturnfans.com/forums/sho....php?p=2193404

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Old 05-31-2018, 02:26 PM   #8
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Default Re: P0420 Power Catalyst System Efficiency below threshold (Bank 1)

The Astra has two O2 sensors, right? When you say you replaced the O2 sensor I am guessing you replaced the one behind the cat, right?

EDIT: Dumb question, you guys mentioned downstream sensor like 5 times....

Last edited by ulemon; 05-31-2018 at 02:35 PM..

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Old 07-27-2018, 10:46 AM   #9
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Default Re: P0420 Power Catalyst System Efficiency below threshold (Bank 1)

Hey so I had a P0420 code, I bought an O2 sensor and spacer from Amazon. O2 sensor was ACDelco 55565000 and put that in the rear downstream O2 sensor location. I no longer have a P0420 code but I do have new codes that are P0161 and P0141 which is to do with the heater circuit for the sensor. So I guess my question is should I replace the o2 sensor again? Or is the computer confused that my o2 sensors have good data now? I checked live data from rear o2 sensor and its at a nice 430mV all of the time. Front o2 is fluctuating between rich and lean as expected and rear is lean.

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Old 07-27-2018, 11:25 AM   #10
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Default Re: P0420 Power Catalyst System Efficiency below threshold (Bank 1)

ulemon, as you know, the original poster crzyalbo are like many members not following up to report whether or not a solution solved their problem. This leaves many threads open.

I'm not sure why there are two error codes, P0161 and P0141, pointing to the same problem (rear downstream heater in the O2 sensor). The heater, wiring and connections are issues, not the actual sensor itself that you verified by seeing output signals.

P0141 - https://www.obd-codes.com/p0141

P0161 - https://www.obd-codes.com/p0161

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Old 07-28-2018, 12:05 AM   #11
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Default Re: P0420 Power Catalyst System Efficiency below threshold (Bank 1)

Quote:
Originally Posted by ulemon View Post
Hey so I had a P0420 code, I bought an O2 sensor and spacer from Amazon. O2 sensor was ACDelco 55565000 and put that in the rear downstream O2 sensor location. I no longer have a P0420 code but I do have new codes that are P0161 and P0141 which is to do with the heater circuit for the sensor. So I guess my question is should I replace the o2 sensor again? Or is the computer confused that my o2 sensors have good data now? I checked live data from rear o2 sensor and its at a nice 430mV all of the time. Front o2 is fluctuating between rich and lean as expected and rear is lean.
I would like to add, that I am a little down on gas mileage (usually 26, im at 22 right now) and I am a little down on power but don't ask me how I know that all I will says im down on power by about 10 miles per hour while gunning it

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Old 07-30-2018, 10:36 AM   #12
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Default Re: P0420 Power Catalyst System Efficiency below threshold (Bank 1)

My bad. i mucked around with things and eventually i changed both Cats. Car performs much better, in terms of mileage and quickness.

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