I have a 1999 Chevy Suburban K1500 5.7L with 173000 miles. I just replaced the starter & ignition switch. Got it running again, but am now showing a check engine light. On a couple of starts since installing the ignition switch the security light has also come on and stayed on, but it didn't affect the drivability. The truck hasn't been driven in the past 3 years and I can't remember if the check engine light was on or not before I stopped using it. I took it to AutoZone and had them pull the codes for it, but they couldn't tell me much beyond that. I also took it to the dealer and they wouldn't tell me anything except " $92 for an emissions diognostic", even though I had the codes in my hand. The codes that came up are as follows:
P0135 - HO2S 11 Heater Condition (Heated Oxygen Sensor Bank 1 Sensor 1)
P0155 - HO2S 21 Heater Condition (Heated Oxygen Sensor Bank 2 Sensor 1)
P0141 - HO2S 12 Heater Condition (Heated Oxygen Sensor Bank 1 Sensor 2)
P0161 - HO2S 22 Heater Condition (Heated Oxygen Sensor Bank 2 Sensor 2)
What is most likely to cause this problem?
-Bad O2 Sensors?
Just wondering where I should start and how to test? Thanks in advance for your time.
Wednesday, September 12th, 2007 AT 3:15 PM