Question about 1999 GMC Yukon
This code refers to the front oxygen sensor on Bank 1. Basically the oxygen sensor is inactive. Here's why:
The powertrain control module (PCM) provides a baseline voltage of about 450 mV on the oxygen sensor signal circuit. When cold, the PCM detects the the internal resistance of the sensor is high. As the sensor warms up the resistance is lowered and it starts producing voltage based on the oxygen content in the exhaust. When the PCM determines that the time it took for the sensor to warm up is greater than one minute or that the voltage is inactive (not reading outside 391-491 mV it views the sensor as inactive or open and sets the P0134 code.Potential Symptoms
One or more of the following may occur:
Posted on Dec 10, 2009
Code po134 is HO2S 11 bank 1 sensor 1 insufficient activity conditions.what its saying you have HO2S sensor failed.
Posted on Dec 10, 2009
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Posted on Jan 02, 2017
P0134 - bad O2 sensor, faulty wiring, blown heater circuit fuse, holes in exhaust, failed PCM
P1684 - Battery Disconnected Within Last 50 Starts
Posted on Sep 11, 2009
Tips for a great answer:
HO2S-11 (Bank 1 Sensor 1) Insufficient Activity
HO2S heater is damaged or has failedHO2S signal or ground circuit has a high resistance conditionHO2S signal circuit is open or shorted to system power (B+)HO2S has failed (i.e., it is silicon, water or fuel contaminated)PCM has failed.Sounds like you need a new oxygen sensor,Bank 1 Sensor 1 is located on the exhaust manifold, closest to the front.Here's a link to the firing order,bank one is cylinder one side.Here's the part you need,here's how to replace.
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