What Problems Will Occur if Your Upstream Oxygen Sensor Goes Out?

Answer Oxygen sensors constantly read the oxygen content of your vehicle's exhaust manifold, sending voltage signals to the engine's fuel injection computer to regulate the air-fuel mixture needed to prop... Read More »

Top Q&A For: What Problems Will Occur if Your Upstream Oxyge...

What Is an Upstream Oxygen Sensor?

Oxygen sensors, like anti-lock brakes and radial tires, are one of those little automotive inventions that went from nonexistent to ubiquitous practically overnight. The O2 sensor is your engine ma... Read More »

How to Fix the Upstream Oxygen Sensor on a VW?

The oxygen sensors on your VW are used by your vehicle's computer to monitor and adjust the fuel-to-air ratio in your engine's combustion chambers. The upstream sensor measures the emissions flowin... Read More »

How to Troubleshoot an Upstream Oxygen Sensor?

An O2 sensor measures the contents of the exhaust gasses coming out of the engine. These types of sensors are typically plugged into the catalytic converter or exhaust system to measure how many to... Read More »

Is the bank 1 oxygen sensor the upstream?

It depends on whether it is located in the exhaust stream before the catalytic converter. In single-exhaust systems, Sensor 1 is upstream and Sensor 2 is downstream. In dual-exhaust systems, Bank 1... Read More »