Question about 2003 GMC Sierra 1500

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1999 GMC Sierra 5.3L knocking sound around Catalytic Conerters? ?

I've put in new Catalytic Converters, 2 new O2 sensors...and new Knock Sensor w/ connector...but still shows up knock senor low input trouble codes and Bank 1 Sensor 2 oxygen sensor ?

Fuel pump makes a loud humming noise, and bout to replace the A/C Compressor...

What could be the problems if you could please explain to me thank you whoever??? And where exactly is this Oxygen sensor located on the Bank 1 Sensor 2...after the driver converter or before or on the passenger side ?

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On my gmc i have 2 knock sensors and im not possitive if you have two or not under your intake mani but when i replaced both mine i got the same code of low input so i took the small needle out and wire brushed it clean and also traced and ran a new wire just to be safe and that solved my problem. as for bank 1,2 if it helps any my bank one is located engine side driverside and bank2 is engine side passenger side and 3 and 4 are underneath bed side. but you can see the sensors if you look real close near the headers. hope this helps
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Posted on Jul 02, 2009

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If you find that this is information was helpfulto you, please rate me and leave a comment as this will encourage me to do morefree work for you and others. And please let me know if there's anything else Icould help you with. Without any inputswe cannot proceed assisting... Thank you for using FIXYA! Best regards,
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