How many O2 sensors does a 2007 Dodge Ram 1500 4.7 have?

Four oxygen sensors in total — two upstream sensors before the catalytic converters and two downstream sensors after them, one pair on each exhaust bank.

The 2007 Ram 1500 with the 4.7L V8 uses a dual-bank exhaust system. Each bank has its own upstream and downstream oxygen sensor, enabling the engine control module to monitor air-fuel balance and catalytic converter efficiency across both banks.

O2 sensor layout on the 4.7L V8

Understanding the sensor roles helps identify where they are and why there are multiple sensors. Upstream sensors (before the catalytic converter) measure the air-fuel ratio, while downstream sensors (after the catalytic converter) monitor catalytic performance.

Sensor locations by bank

To visualize the arrangement, here's a breakdown of sensor positions by exhaust bank. Each bank has two sensors: one upstream and one downstream.

Where they sit on the Ram 1500's exhaust system:

• Bank 1 Upstream O2 Sensor (pre-cat, near the Bank 1 exhaust manifold)


• Bank 1 Downstream O2 Sensor (post-cat, after Bank 1 catalytic converter)


• Bank 2 Upstream O2 Sensor (pre-cat, near the Bank 2 exhaust manifold)


• Bank 2 Downstream O2 Sensor (post-cat, after Bank 2 catalytic converter)

Note: The exact locations can vary by vehicle production date and exhaust kit, but the standard configuration is four sensors in total, two per bank.

Practical notes on replacement and diagnostics

When diagnosing exhaust sensor issues, starting with the upstream sensors is common, since they influence fuel trimming and driveability. If a sensor fails, the check engine light may illuminate and you may see related OBD-II codes. OEM or high-quality replacements are recommended, and many after-market sensors are universal but require correct wiring and fitment.

Ensure you disconnect the battery and follow proper anti-seize and wiring harness handling when replacing sensors. After replacement, clear codes and test drive to confirm proper operation.

Summary

The 2007 Dodge Ram 1500 with the 4.7L V8 typically uses four O2 sensors in total—two upstream sensors before the catalytic converters and two downstream sensors after them, one pair on each bank. This arrangement allows the engine control module to accurately monitor exhaust chemistry and catalytic converter performance, ensuring optimal fuel efficiency and emissions compliance.

How do I know which 02 sensor is bad?

You can identify a bad O2 sensor through a lit Check Engine light, poor fuel economy, and rough idling, but the most reliable methods involve using an OBD-II scanner or a multimeter to check live data or voltage readings. A scanner can read diagnostic trouble codes (DTCs) that pinpoint the specific sensor, while a multimeter can confirm if the sensor's voltage fluctuates correctly between 0.10.10.1 and 0.90.90.9 volts as it should. 
Symptoms of a bad O2 sensor

• Check Engine Light: This is often the first indicator that an issue has been detected. 
• Poor fuel economy: A faulty sensor can cause the engine to burn more fuel than necessary. 
• Rough idle or misfires: The engine may run unevenly or hesitate. 
• Engine pinging: This can occur if a bad sensor affects the engine's timing. 
• Failed emissions test: The engine's emissions can be too high, leading to a failed test. 
• Black exhaust smoke: This can indicate the engine is running too rich, with more fuel than air. 

How to diagnose the specific sensor

• Use an OBD-II scanner: Plug the scanner into your car's port and check for Diagnostic Trouble Codes (DTCs). Specific codes like P0130–P0160 often point directly to an O2 sensor. The scanner may also show live data, allowing you to monitor the sensor's voltage readings. 
• Use a multimeter: 
  • Connect the multimeter to the sensor's signal wire and a good ground. 
  • Start the engine and let it warm up. A healthy sensor's voltage should fluctuate between 0.10.10.1 and 0.90.90.9 volts. 
  • If the voltage stays constant or is outside this range, the sensor may be bad. 
  • You can also use a multimeter to check the heater circuit's resistance, especially if the code indicates a problem with the heater element. 

Other things to check

• Physical damage: While you can't always tell by looking, inspect the sensor for any obvious damage, broken wires, or signs of melting. 
• Catalytic converter: Some codes, like P0420, can indicate a failing catalytic converter, which can be related to a bad O2 sensor. A professional can perform a heat test on the converter to check its function. 
• Professional help: If you don't have the tools or expertise, a certified technician can perform a professional diagnosis. 

How many O2 sensors does a Dodge Ram 1500 4.7 have?

The 2008 Ram 1500 4.7L has four oxygen sensors: two upstream (pre-catalytic converter) and two downstream (post-catalytic converter). Upstream sensors monitor air-fuel mixture, while downstream sensors check catalytic converter efficiency.

What are the common problems with a 4.7 Dodge engine?

Common problems with the Dodge 4.7L engine include valve seat failure, head gasket failures, and oil sludge buildup, often triggered by the engine overheating. Overheating is a major issue that can lead to catastrophic damage, so maintaining the cooling system is critical. Other problems include external oil leaks, a poorly functioning hydraulic cooling fan, and issues with hydraulic valve lash adjusters.
 
This video explains the common problems with the 4.7L Dodge engine and their potential causes: 59sSimple Mechanic AdviceYouTube · Nov 3, 2024
Overheating and associated issues 

• Valve seat failure: The valve seats can fail and come out, causing a loss of power, misfires, and potential damage that requires a cylinder head rebuild or replacement. 
• Head gasket failure: The engine is prone to head gasket issues, especially if it overheats. 
• Clogged radiator, failed water pump, or stuck thermostat: These can cause the engine to overheat if the cooling system is not maintained. 

This video discusses the 4.7L V8 PowerTech engine, its reliability, and the issue of overheating causing head gasket failure: 1m8020 AutomotiveYouTube · Oct 3, 2024
Lubrication and internal engine problems 

• Oil sludge buildup: Sludge can form due to incomplete combustion and oil breakdown, clogging oil passages and starving the engine of oil. This is particularly common in early models and can be exacerbated by a poor PCV system. 
• Hydraulic valve lash adjuster problems: The adjusters can become plugged due to lack of oil flow, leading to improper valve train function. 
• Oil leaks: Common leak points include the valve covers, oil pan, and rear main seal. 

Other common problems

• Hydraulic cooling fan: The hydraulic fan system, powered by the power steering pump, can be unreliable. If the pump fails, the fan will not run, leading to overheating. Incorrect power steering fluid can also cause the fan to malfunction. 
• Carbon buildup: Excessive carbon can build up on the intake, valves, and pistons if the engine is not regularly serviced or is run on low-quality fuel. 
• Wear and tear: Like any engine, many problems are age-related, such as failing valve cover gaskets and other rubber components degrading over time. 

This video explains how to keep the 4.7L Jeep/Dodge engine running well and discusses the fatal flaws, including the hydraulic cooling fan: 50sD&E In The GarageYouTube · Jun 29, 2020

How many O2 sensors are on a 2007 Dodge Ram 1500?

4 Oxygen Sensor for 2005 2006 2007 Dodge Ram 1500 4.7L Upstream + Downstream.