I have a 2000 chevy suburban with codes p1133 and p0131 what is the pooblem

Error code P0131 is described as O2 Sensor Circuit Low Voltage Bank 1 Sensor 1. This indicates there is a problem in the wiring, such as corrosion, breaks or separation.

code p0131 refers to heated oxygen sensor (HO2S) bank 1 low voltage. possible causes ---Exhaust leak wiring short to ground HO2S ans ecm I would check the wires are not touching the exhaust then replace the sensor with a genuine one as the settings may be different on an after market one giving a false code
.Code p0300 refers to random / multiple cylinder/s --- misfire detected. Possible causes include Spark plug/s--- HT leads---injectors--- ignition coils----low compression and wiring

HI ghosthunter6 codes P0131&P0137&P0341 indicative of having electrical short .
P0131 Front Heated Oxygen Sensor Bank 1 harness is open or shorted .
P0137 Rear Heated Oxygen Sensor Bank 1 harness is open or shorted .
P0341 Camshaft position sensor harness or connectors (The sensor circuit is open or shorted) .
code B1218 horn relay coil circuit short to voltage battery .
IT could be cousin problem with other sensors .
First replace horn relay and clear E C M codes
IF problem and codes P0131&P0137 come back you need o2 sensors .put I don't thank so.
YOU MUST REPLACE HORN RELAY .OK

good luck

disconnect the front oxygen sensor and with key on see if it has b+ and ground on the harness side going to computer. if it has b+ and ground replace the sensor.

Sounds like you just need to replace the one or two 02 sensors on bank 1.If you have over 100,000 miles the 02 sensos are realy to be replaced just as spark plugs and air filteres. If you wait to long to replace them you take a chance of them not comming out and then when they do go bad you will need to replace the exhaust as well.Hope this helps and good luck.

Your O2 sensor is starting to go bad .recomend replacement before it gets worse

if you replaced the sensors, you have to clear the codes with a obd2 scantool, otherwise its still gonna show a fault.

p1133 - o2 sensor, Insufficiant Switching, Bank 1 Sensor 1.
p0131 - o2 sensor circuit, low voltage, bank 1 sensor 1
p0171 - Lean condition, Bank 1
p0300 - Random Misfire

I would be looking at the front passenger side oxygen sensor for issues. It may be bad, it may not be plugged in, bad wiring at harness.

The random misfire may be symptomatic of the o2 sensor problem.

throttle position sensor

Per your description, it sounds like you have a vacuum leak.
Check all vacuum hoses at the engine, make sure no hoses are disconnected, cracked or damaged.
Disconnect each hose at the source on the engine and see if the engine idle stabilizes.
Let me know what you find and we can go from there.
Regards.