How many O2 sensors does a 5.7 Hemi have RAM?
Typically four O2 sensors. The RAM version of the 5.7L Hemi uses two upstream sensors and two downstream sensors, one set on each bank of the V8, for a total of four sensors.
The 5.7-liter Hemi is a V8 with two banks of cylinders on a RAM pickup. To monitor exhaust efficiency and help the engine control module manage emissions, each bank generally carries an upstream sensor before the catalytic converter and a downstream sensor after it. While four sensors are standard, exact placement can vary by model year and exhaust configuration.
Sensor layout and function
The following list shows where the four sensors are typically located on a RAM equipped with a 5.7 Hemi.
- Bank 1 upstream (pre-cat) sensor
- Bank 1 downstream (post-cat) sensor
- Bank 2 upstream (pre-cat) sensor
- Bank 2 downstream (post-cat) sensor
In practice, sensor placement can differ slightly depending on year, model, and whether the vehicle uses a dual exhaust system or a different cat configuration. Always refer to the specific service manual for your RAM's exact layout.
Variations by model year and exhaust configuration
Standard RAM 5.7 Hemi models with a dual exhaust system typically maintain four O2 sensors. Some variations or aftermarket exhaust setups can alter sensor counts or positions, but the OEM configuration for most RAM trucks remains four sensors—two upstream and two downstream—spanning both banks of the engine.
- Standard dual-exhaust layout: four sensors (two pre-cat, two post-cat)
- Non-standard or aftermarket exhaust configurations: sensor quantity or placement may differ
If you’re diagnosing an issue or planning maintenance, verify the sensor count and locations for your exact vehicle-year/trim with the official service documentation or a trusted repair manual.
Summary
For a RAM vehicle with a 5.7 Hemi, expect four O2 sensors in total: two upstream sensors and two downstream sensors, one per bank. This arrangement enables the engine computer to monitor exhaust gas composition before and after the catalytic converters. While four sensors is the standard configuration, always confirm with your specific vehicle’s documentation, as variations can occur with different exhaust setups or model years.
