Question about 2007 Chevrolet Equinox LS New Cars

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How do I check for a bad fuse block

2005 Chevy Equinox..keeps giving code 0420 (bad emissions-catalytic or sensors bank 2. Mechanic said fuse block or panel was bad??
Are these hard to replace..any idea on cost for part and labor??

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Code 420 is catalytic converter is not efficient and should be replaced i am sorry no fuse will fix this.get a new mechanic.this fairly common on these vehicles .

Posted on Jan 29, 2009

  • 1 more comment 
  • Jay Maechtlen
    Jay Maechtlen Jan 13, 2014

    "or sensor" ? Rember, the computer uses the sensors to tell it if the cat converter is working properly. It isn't necessarily the converter - but it could be.

  • mike loshbough
    mike loshbough Jan 19, 2014

    After working on over 45,000 cars in my life only 6 times has a downstream o2 fixed the problem ,but not on these vehicles

  • mike loshbough
    mike loshbough Jan 19, 2014

    After working on over 45,000 cars in my life .Only 6 times has a dpwnstream o2 fixed the problem and not once on these vihecles.

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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
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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.

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The definition of code P0420 Is Catalyst Efficiency. You may have an oxygen sensor problem or a catalytic converter problem. Your vehicle has 2 oxygen sensors. Check your oxygen sensors.If they are then you may need a catalytic converter. Depending on your mileage it may be covered under a Dodge emissions warranty. Have it checked by a certified garage first and in the meantime contact your local Dodge dealer and find out the emissions warranty most are 8 yr or 80,000 miles.

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P0421 is Warm Up Catalyst Efficiency Below Threshold (Bank 1)
Basically this means that the oxygen sensor downstream of the catalytic converter on bank 1 is detecting that the converter is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

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