LT1-LT4 Modifications 1993-97 Gen II Small Block V8

anyone had these codes?

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Old 08-01-2007, 08:07 PM
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Default anyone had these codes?

P0101
P1573
P0125
P0171
P0172
P0400
P0420
these codes recently came out when i had my comp checked? is anyone familiar with these codes? have u had them come up and how did you fix the problem? any help will be appreciated..thanks
Old 08-01-2007, 08:35 PM
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P0101= mass air flow circuit, range or performance problem
P0125= insufficient coolant temp for closed loop fuel control
P0171= system to lean,left bank on 4 sensor systems
P0172= system too rich, left bank on 4 sensor systems
P0400= EGR flow fault
P0420= catalyst system efficiency below threshold, left bank P1573????????
Old 08-01-2007, 08:58 PM
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any thought of what might be causing these codes? how to fix?
Old 08-01-2007, 09:04 PM
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Do you have any performance loss when driving or is it still the same
Old 08-01-2007, 09:09 PM
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i have performance loss...feels like fuel loss..really sluggish
Old 08-01-2007, 09:17 PM
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I would go get your EGR valve checked. That would definetly alter your performance if faulty
Old 08-01-2007, 09:32 PM
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what exactly does the EGR valve do? whats it for?
Old 08-01-2007, 10:32 PM
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It's emissions control. You're in Cali. You're fucked, lol.



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