1999 i30 pulled multiple codes i need HELP!!

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760tito

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sorry but im having issues with my cousins car. she got the codes pulled and here is what they came up with. CODE READS P0325 KNOCK SENSOR 1 CIRCUIT P01743 BANK 2 SYSTEM TOO LEAN P1440 MANUFACTURER CONTROLLED AUX EMMISIONS CONTROLS REQUIRES EGR GASKET, INTAKE MANIFOLD GASKET, AND KNOCK SENSOR. AFTER LEAKS ARE FIXED FURTHER DIAGNOSIS IS REQUIRED FOR CODE P1440


now im assuming the want to replace all those gaskets to eliminate intake leaks? or is it they want to remove the intake to get to the knock sensor? she doesnt have the $987 they quoted her so im trying to help her out....any info would be greatly appreciated. she did say it has a newer knock sensor so ill take hers out and test it if i can. thank you for your time!
 
it runs and drives great! just need to smog it but the ses light is on. it does get a lil funny when it gets to idle like the idle fluctuates a lil but not alot and not all the time.
 
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