How to fix codes P0134 P0141 and P1133 on 2003 GMC Denali?

Which O2 sensors came out of the vehicle an which did you put back in ? Two different types for that vehicle.

DTC P0134 or P0154 (w/LR4 and LM7 w/ Delphi HO2S)
DTC P0134 or P0154 (w/LR4 and LM7 w/ Denso HO2S)
DTC P0134 or P0154 (w/LQ4 w/Denso HO2S)

Your main problem starts from the Lamda sensor ( bank2)

However the P0102 is ignition problem on cylinder 2
the P0134 is the air flow meter .

others are all lamda.

So first you have to plug diagnostic and check all the missfires from the cylinders to see if the cylinder 2 is a real problem or iconic.
Then count the air measured VS the air targeted by the ECU ( demanded) .

Then go to lambda which is the prime suspect here.



As for the heater. It runs only on the 4th speed or in any case it doesnt work? If it doesnt work in any case you have remove the fan and give external 12V to see if its gonn work. if it works in 4th speed its the ressistant.

Roof May need setup again since you removed BAT+ ?

Trouble codes? If none, then check O2 sensor outputs and replace as needed. Could be a leaking intake manifold gasket if you get "lean banks" codes. This happens in cold winters, but fixes itself in Spring.

P0141 Heated o2 sensor. P0134 Heater 02 sensor circuit, These 02 sensor has a fuse in the engine junction box listed as IGN 1. This supplies 12volts to the heater circuit, check to make sure its not a open fuse. If you already replaced the sensors make sure you clear the code. or it will stay in memory.

po134 is o2 sensor bank 1 sensor 1
po161 another o2 sensor
p1345 crankshaft position sensor
possible cause for o2 are vehicle control module (PCM) or wiring

Hi,
Please get the code first to locate the problem, before it get fixed.

I need to know what code's you got from the KOER test, if no codes system ok while running.

Given that most of the trouble codes are for the O2 sensor, I think I would change it. The multiple misfires could be because of improper fuel/air mixture caused by a bad sensor. Disconnect the negative(-) battery terminal then change the sensor. Disconnecting the negative(-) should reset the computer and allow the fuel/air mixture to return to default allowing the engine to start.
P0130 - O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)
P0134 - O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
P0135 - O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P0141 - O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
P0300 - Random/Multiple Cylinder Misfire Detected

po134 o2 sensor no activity bank 1 sen. 1 po130 o2 sensor bank 1 sen1

P0108 - Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage,
Possiable MAP sensor defective

P0134 - Heated Oxygen Sensor (HO2S) Circuit Insufficient Activity Bank 1 Sensor 1
P0141 - Heated Oxygen Sensor (HO2S) Heater Performance Bank 1 Sensor 2 , I recommend you replace both O2 sensors, bank 1 and bank 2