If your Chevy Silverado is racking increase miles, girlfriend might notification a far-reaching decrease in fuel economy and engine power. Even though these symptoms are usual of an aging engine, the O2 sensors could be faulty, resulting in your examine engine light to turn on and your truck to failure its emissions test.
This article uses to the Chevrolet Silverado GMT800 (1999-2006).
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O2 sensors measure the oxygen level in her truck"s exhaust gas before and after passing through the catalytic converter. By measuring the amount of oxygen leftover after ~ engine combustion, the truck"s on-board computer can adjust the air-to-fuel ratio accordingly. By keeping this mixture balanced, the computer avoids the engine indigenous running too lean or too rich. If the lot of oxygen is as well low, the engine will start to run rich, meaning it"s dumping un-burnt fuel into the exhaust. If the amount of oxygen is too high, the engine will begin to operation lean, which can lead to detonation and further engine damage if left untreated. Make certain the O2 sensors in your Silverado room functioning properly, and if necessary, replace them by complying with the actions below.
Materials NeededUpstream O2 sensors (2)Downstream O2 sensors (2)Flat head screwdriver7/8" Crescent wrenchBreaker bar (optional)Wire cutters
There are 4 O2 sensors in 1999 come 2006 Silverado models: 2 upstream and two downstream sensors. The upstream sensors room located in between the exhaust manifold and also the exhaust, if the downstream sensors are situated after the catalytic converter.Upstream driver"s side O2 sensor: financial institution 1, Sensor 1 (B1/S1)Upstream passenger"s side O2 sensor: financial institution 2, Sensor 1 (B2/S1)Downstream driver"s next O2 sensor: bank 1, Sensor 2 (B1/S2)Downstream passenger"s side O2 sensor: financial institution 2, Sensor 2 (B2/S2)
Replacing the Downstream O2 SensorsStep 1 – Disconnect the battery and also lift your truck (if needed)
Always disconnect the an unfavorable terminal (black cover) of the battery when working with electric components and also wiring. It"s not crucial to lift her truck, yet you deserve to do therefore for much more work space.
(Related Article: exactly how to Jack Up her Truck - centregalilee.com)Step 2 – eliminate the old O2 sensors
Figures 4 v 6 listed below show the replacement of the B2/S2 (passenger"s side) O2 sensor. However, replacement of the B1/S2 (driver"s side) O2 sensor is the same process.Using your level head screwdriver, pry out the clip hold the wire harness to the sheet metal.Disconnect the O2 sensor cable harness native the sensor.Use the 7/8" Crescent wrench to remove the O2 sensor. You may need a breaker bar because that extra leverage.
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Replacing the Upstream O2 SensorsStep 1 – remove the old O2 sensors
Figures 10 v 12 listed below show the remove of the B2/S1 (passenger"s side) O2 sensor. However, replacement of the B1/S1 (driver"s side) O2 sensor is the exact same process.Use wire cutters to reduced the clip securing the O2 wire harness come the structure rail.Pull the wire harness free and disconnect it.Using a flat head screwdriver, pry out the metal clip securing the cable harness that"s directly connected to the O2 sensor.Use the 7/8" Crescent wrench to remove the O2 sensor. You may need a breaker bar because that extra leverage.
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