What Are the Types of Oxygen Sensors?

[OHector]

There are mainly the following types of oxygen sensors: 1. Standard Oxygen Sensor: Automotive oxygen sensors mainly include zirconia type and titanium dioxide type. 2. Air-Fuel Ratio Sensor: The air-fuel ratio sensor can continuously detect the air-fuel ratio across the entire range from rich to lean mixtures. Compared to standard oxygen sensors, such sensors enable feedback control of the air-fuel ratio throughout the engine's operating range, achieving optimal fuel consumption, emissions, and performance in all regions. 3. Nitrogen Oxide Sensor: The nitrogen oxide sensor is used to identify and check whether the function of the three-way catalytic converter is normal.

[StLila]

I've given this a lot of thought. In over a decade of auto repair, I've found there are mainly two types of sensors that really matter. The most common is the zirconia type - that white ceramic tube installed in the front section of the exhaust pipe. It generates electrical signals for the ECU based on the oxygen concentration difference between inside and outside. When exhaust is lean, voltage drops to 0.1V; when rich, it can spike to 0.9V. The one I replaced on Old Zhang's Corolla last time was exactly this type - his sudden fuel consumption surge was caused by its signal drift. Many newer cars now use titanium oxide sensors, which work on a completely different principle. These change resistance with oxygen levels and require vehicle power to heat up before functioning. Just last week at the tuning shop, we took apart a Civic with heating wires wrapped around its exhaust pipe - that's this type. They're particularly prone to carbon buildup during cold starts. The real high-end stuff is the wideband oxygen sensor - five wires with heating capability, able to measure continuous air-fuel ratio changes from 0-5V. It's basically standard on German cars. Painfully expensive to repair, but the fuel efficiency gains are real.

[NoraRose]

Titanium oxide sensors are absolutely fascinating! At their core, they're essentially semiconductor resistors. The housing looks similar to zirconia sensors, but inside there's a titanium dioxide ceramic wafer. This material is extremely sensitive - when oxygen concentration in exhaust gas increases, the resistance value shoots up rapidly. In practical applications, the engine ECU provides a 5V reference voltage, and we can observe 0-5V fluctuating signals in the data stream. I remember discovering a pattern last year when working on hybrids: the resistance changes most dramatically at the 14.7 air-fuel ratio, but it won't function at all below 200°C. Once a customer used substandard gasoline, causing coking on the sensor surface that led to signal delay - the engine warning light was flashing like a disco ball!

[DiMatteo]

Ladies, listen up! This works similarly to our skin analyzers. Mainstream oxygen sensors come in three types: The most common is zirconia tube type, which relies on exhaust pipe temperature for self-heating and tends to respond slowly in winter. The more refined titanium chip type comes with heating wires like curling irons that need preheating, providing more stable signals. My bestie's Mini threw a fault code last year - diagnosis showed carbon buildup on this type of sensor. Luxury cars now use wideband types with smart chips like smartphone processors, capable of real-time air-fuel ratio adjustment to protect catalytic converters. During maintenance, remember to ask technicians to check sensor connectors - cleaning the contact points when unplugged can save you $2,000 compared to replacement, enough for a full set of lipsticks!