Po42 and po43 on my gmc 1991 1500 - 1991 GMC C1500

Here is your 478 page Owner's Manual as a PDF file.
https://cdn.dealereprocess.org/cdn/servicemanuals/gmc/2011-acadia.pdf

Expensive to buy as a paper version!

2011 GMC Acadia and Denali Owners Manual - Amazon ...

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GMC Acadia Owner's Manual PDF [2007-2022]

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Download GMC Acadia owner's manuals in PDF format for the years 2007 to 2022. View the GMC Acadia manual online, print or download it to keep on your ...

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2011 GMC Acadia & Acadia Denali Owners Manual User Guide Reference Book OEM (Fits: GMC Acadia). C $47.98. Was: C $73.80. C $16.20 shipping. Only 1 left!

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Check out the link. click on the images tab. You really need a service manual.

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Jun 16, 2017 - 2000 GMC JIMMY Service Repair Workshop Manual provides step-by-step instructions based on the complete dis-assembly of the machine. It is this ...

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2000 GMC Jimmy Service Repair Manuals for factory, Chilton & Haynes service workshop repair manuals. 2000 GMC Jimmy workshop repair manual PDF.
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Fuse 44 only does the 'Right Window'. This vehicle has HUNDREDS of fuses!

https://www.autogenius.info/gmc-yukon-2015-2016-fuse-box-diagram/

GMC 2016 Yukon XL Denali Owner's Manual [Page 297]

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GMC 2016 Yukon XL Denali Manual Online: block, Rear Compartment Fuse Block. The Rear Compartment Fuse Block Is Behind The Access Panel On The Left Side Of ...

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GMC Sierra/Sierra Denali is also called VIA Vtrux Truck and Chevrolet Silverado LD. ... A fuse puller is available in the left instrument panel fuse block.

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All OBDII trouble code are 5 digits. So repost with the correct codes

P0430 https://www.obd-codes.com/p0430

P0420 TOYOTA - Catalyst System Efficiency Below Threshold Bank 1

Read more: https://www.autocodes.com/p0420_toyota.html

take it to the nearest advance auto they plug in a small computer and it will tell you exactly what those code mean for free or you can buy your own diagnostic computer for about $80

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A code P0430 may mean that one or more of the following has happened:

• The catalytic converter is no longer functioning properly
• An oxygen sensor is not reading (functioning) properly
• There is an exhaust leak

If the Ox sensor has never been replaced I would do that.. Its a lot cheaper than the CAT. The one that needs to be replaced is AFTER the Catalytic Converter.

A good shop should be able to tell if this is your issue or not though.