Question about 2000 Chevrolet Silverado 1500

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The first time I had it scanned it said MAF malfunction, Then Codes 420& 430, saying bank1 &2 are bad. Then, I had those codes erased, and drove again to see when the check engine lite would come on. It did about 10 15 minutes later. So, I scanned it again and now it just says codes 430& 420. So, the question is do I need to just replace the two O2 sensors, all four, or the MAF and all four?

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Hi, the o2 sensor codes may be a result of the maf. If the mass air flow sensor does not show the correct flow, the fuel mixture could be accomodating accordingly, resulting in a rich, or lean condition, setting codes. If there is a plugged, or restricted air filter, or a piece of debris on the sensor, this could cause a faulty reading. Also, make sure the air duct is tight at the throttle body, and the maf sensor is tight. Last, if you use a K&N filter, that uses an oil charge, there may be oil residue coating the maf sensor, causing an issue, or just a faulty sensor. At any result, I feel you should fix the maf issue, before the o2, as this is the order of operations, and you may not need o2 sensors. Good luck...Coop

Posted on Oct 03, 2010

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WHAT ARE CODES PO330 AND PO320 CTS 2006 CADILAC


I use this website all the time:
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Why would you change any items?

Have you not googled the code?

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445-Evap Purge Valve Circuit Shorted


Sorry about the short & poorly displayed codes


I would be here all day telling you things as other experts do,
just to make it look nice


I suggest you google the codes & study them


You 2 upsteam O2 Sensors may have slowed down & set
the faults as they should be over 100,000 miles


The rear monitors are a bit of a mistery as the converter
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The evap code & purge valve you have to diagnose for sure


Working in you driveway with only a code reader,no experience
no factory manuals & charts to follow or test equipment,you
hand cuffed

I would only do the 2 front sensors based on mileage,check for
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You really need professional scan software so you can take it for
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We need a more complete story & some detail here, to
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How about a year,make,model,engine & some codes

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You can put any code or question in to google,etc & get
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Wow!, I answered this about 30 minutes ago, but somehow my answer didn't post.

Fault code 420 is Catalyst system efficiency below threshold, ( bank 1 )
Fault code 430 is the same as above but, ( bank 2 )

Fault codes do not determine what part is bad, they just reduce the field for troubleshooting.
This is what I would have checked;
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2. Oxygen sensor, downstream ( meaning after the catalytic converter )
3. MAF, ( mass air flow ), sensor
4. Idle air control sensor.

Your problem will be with the emission system.

I hope this helps you.

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