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Code P171 and P174 SES Light

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Old Mar 8, 2006 | 11:19 AM
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shupe
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Default Code P171 and P174 SES Light
Recently the SES light lit up. Ran by Autozone for the code scan. Anyone know what these code equate to? Recently upgraded my westers ecm. Didn't get this before. I did ask for the post cats sensors to be removed. Haven't removed cats yet. Would that make these code appear?

P.S. I'm running a '99 5.3 w/ ~105k

Thanks in advance...
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Old Mar 8, 2006 | 02:22 PM
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