1999 Chevrolet S10 Heated Oxygen Sensor (part#AFS105)

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With reference to your inquiry on the ACDelco Heated Oxygen Sensor - part# AFS105, P0171 OBD-II trouble code means that an oxygen sensor in bank 1 has detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. The P0171 is one of the more common trouble codes. This code is triggered by the first downstream (front) O2 sensor. The sensor provides a reading of the air:fuel ratio leaving the engine's cylinders, and the vehicles powertrain/engine control module (PCM/ECM) uses that reading and adjusts to keep the engine running at that optimum ratio of 14.7:1. If something is not right and the PCM cannot maintain the 14.7:1 ratio, but rather there is too much air, it triggers this code. For any further assistance, please feel free to call us at: 1-877-238-2623 or visit the nearest Advance Auto Parts store and one of our Parts Pros will gladly assist you with any questions or concerns you may have.

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This ACDelco Heated Oxygen Sensor - part# AFS105 are mounted in the exhaust system where they can monitor the oxygen content of the exhaust gas stream. The oxygen present in the exhaust gas reacts with the sensor to produce a voltage output. This voltage should constantly fluctuate from approximately 100 mV or high oxygen content--lean mixture, to 900 mV or low oxygen content--rich mixture. The VCM calculates what fuel mixture command to give to the injectors based upon voltage output of the oxygen sensor. Lean mixture--low HO2S voltage equals rich command and rich mixture--high HO2S voltage equals lean command. The heated oxygen sensor voltage can be monitored with a scan tool. This Heated Oxygen Sensor fits your 1996 Chevrolet K1500. For any further assistance, please call us at 1-877-ADVANCE (238-2623) and we would be more than happy to assist you.

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Yes, this part ACDelco Heated Oxygen Sensor, part number AFS105 manufactured by ACDelco fits your 2000 Chevrolet Blazer 4X4 .
While removing old Oxygen Sensor, you can either remove them when cold or you can just warm up the manifold a little ( ie; run engine for 1-2 minutes only so that it gets only Warm and not Hot) to help in removal of the old Oxygen Sensor,also in addition to the above you can use PB Blaster to loosen the rusted screws to help you in removal of old Oxygen Sensor,but by performing Do It Yourself work, care should be taken to avoid any damage.

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It said sensor 0 bank 0?

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Check if the vehicle is OBD-1, or OBD-2. If it's OBD-1, there will be 2 Oxygen sensors, one in front of the catalytic converter, and one at the rear of it. If it is OBD-2, there will be four sensors. There will be three on the "Y" pipe from the manifolds, and one before and after the catalytic converter.

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For step by step instructions i recommend that you go to your nearest Advance Auto Parts store and purchase a repair manual.

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You should have a total of 4 oxygen sensors actually. All four will be located on the exhaust system. One on each side of the motor before the catalytic converter and one on each side after or on the catalytic converter.

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The sensor is located either on the exhaust manifold or after the catalytic converter. The vehicle year, make, model and if sensor is pre-cat or post-cat to determine location.