'98 Suburban problems plz help

[RedBeard60]

Hello this is my first time to the forum. My friend has a '98 GMC 1500 Suburban with a 5.7-liter engine. He was telling me that sometimes when he cranks, it doesn't start until the second crank. I just so happened to have my Bosch OBD1300 scan tool with me so we hooked it up and got the following 7 codes...

P0135 - Oxygen Sensor Heater Bank 1 Sensor 1 -confirmed-
P0161 - Oxygen Sensor Heater Circuit Bank 2 Sensor 2 -confirmed-
P1133 - Heated Oxygen Sensor Insufficient Switching Bank 1 Sensor 1 -confirmed-
P1345 - Crankshaft Position/ Camshaft Position Sensor Correlation -confirmed-
P0135 - Oxygen Sensor Heater Bank 1 Sensor 1 -pending-
P1133 - Heated Oxygen Sensor Insufficient Switching Bank 1 Sensor 1 -pending-
P1345 - Crankshaft Position / Camshaft Position Sensor Correlation -pending-

So I'm definitely just a shade tree mechanic and an amateur at that. My first guess would be that this is either a fuel pressure issue and that the crankshaft / camshaft sensor just needs to be tested/ cleaned and/or replaced.
If anybody has any suggestions please reply immediately. Thank you.

 

[zora]

according to this the most common problem for GM is the camshaft position sensor needing replacement. The oxygen sensor wont cause the starting issue but should be corrected to improve gas mileage

https://www.obd-codes.com/p1345