Hello everyone.
I have recently have had my Check Engine Light Soon come back to haunt me again. I will give you a little background of what I have done to the Tahoe to see if you can assistant me the best you can. I have have 1999 Chevy tahoe, 5.7 Liter, base.
I have replaced the Rotor, Cap, Fuel Pump and all 8 Spark Plugs. The light had went off for quit some time. Just Recently it has came back with the Trouble Code PO420 and I checked the Freeze Code which was PO430. Bank 1 & 2 below threshold. I have also changed out Bank 1 O2 Sensor.
Does any know what this may be causing the computer to read??
I have no misfires, It doesn't run hard. I am wondering if it could be fuel injection, but not 100% sure. They looked alright when I changed my spark plugs. But then again I haven't changed them in a few years.
Does anyone have any suggestions??
Thank you
Keith.
I have recently have had my Check Engine Light Soon come back to haunt me again. I will give you a little background of what I have done to the Tahoe to see if you can assistant me the best you can. I have have 1999 Chevy tahoe, 5.7 Liter, base.
I have replaced the Rotor, Cap, Fuel Pump and all 8 Spark Plugs. The light had went off for quit some time. Just Recently it has came back with the Trouble Code PO420 and I checked the Freeze Code which was PO430. Bank 1 & 2 below threshold. I have also changed out Bank 1 O2 Sensor.
Does any know what this may be causing the computer to read??
I have no misfires, It doesn't run hard. I am wondering if it could be fuel injection, but not 100% sure. They looked alright when I changed my spark plugs. But then again I haven't changed them in a few years.
Does anyone have any suggestions??
Thank you
Keith.
Last edited:
