However, generally:
* Bank 1 refers to the bank of cylinders containing cylinder #1. This is typically the side of the engine closest to the passenger compartment.
* Bank 2 is the other bank of cylinders.
The O2 sensors themselves are usually located in the exhaust manifold or the exhaust pipe very close to the manifold. They're threaded into the exhaust system. You'll likely find:
* Upstream O2 sensors (Bank 1 Sensor 1 and Bank 2 Sensor 1): These are closer to the engine, before the catalytic converter.
* Downstream O2 sensors (Bank 1 Sensor 2 and Bank 2 Sensor 2): These are after the catalytic converter.
To find them:
1. Consult your vehicle's repair manual: This is the most reliable source. It will have diagrams showing the exact location of each sensor for your specific engine.
2. Use a repair database: Online resources like AllDataDIY or Mitchell 1 (subscription required) have detailed diagrams and information.
3. Visual Inspection: With the engine cool, carefully look under the vehicle near the exhaust manifold(s). The sensors are usually threaded fittings, sometimes with wires leading to them. Be aware of hot exhaust components!
Caution: Working on the exhaust system involves hot surfaces and potentially hazardous gases. Let the engine cool completely before attempting any inspection or repair. If you're not comfortable with this type of work, take it to a qualified mechanic.
