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I have a 1999 Prerunner 2.7 auto. It has a check engine light for the rear O2 and egr.

I rerouted the vacuum lines on the egr so it never opens the valve. I plan on ordering the block off plates and do the resistor but haven’t gotten around to it.

Do either of these codes cause different fuel patterns or anything?

No emissions here so none of the above is mandatory for registration.

Thanks
 

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95.5 Tacoma
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Rear O2 is just to make sure the cat is functioning, so no issue there. Not sure if the EGR delete affects fuel maps, but not likely.
 
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