Review on Enhanced Performance: Oxygen Sensor Downstream 234 4623 Pontiac for Efficient Fuel Combustion by Lawrence Crespo
Put vehicle through emissions test
Vehicle received an error code through the downstream O2 sensors and failed the emissions test. The scan tool has confirmed that the downstream oxygen sensors are not working. Oxygen sensors 1 and 2 replaced downstream. Conducted a real-time scan, the sensors are working within the expected voltage. The car passed the emission tests without any problems. It is very useful to have heavy O2 sensor keys. Also warm up the exhaust system for a few minutes, be careful when working with hot exhaust pipes, heating the system makes it easier to remove old sensors.
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