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Check Engine Light P0133 on 2017 Ram 1500 Rebel - O2 Sensor?

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Mike T. · rep 0 · May 22, 3:34 AM · 1 replies · solved · Question

Vehicle: 2017 Ram 1500 Rebel

Hey everyone,

My 2017 Ram 1500 Rebel (5.7L Hemi) recently threw a Check Engine Light. I used my OBD-II scanner, and it's showing a P0133 code: 'O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)'. The truck seems to be running a bit rough at idle, and I think my fuel economy has dipped slightly.

Is this definitely an O2 sensor issue, or could it be something else? How difficult is it to replace this sensor on a Ram 1500? Any tips or common pitfalls I should be aware of?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:34 AM

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ClearTheCode admin answer:

The P0133 diagnostic trouble code (DTC) indicates that the oxygen sensor on Bank 1, Sensor 1 (upstream sensor on the side of the engine with cylinder #1) is responding slowly to changes in the exhaust gas oxygen content. This can indeed lead to symptoms like rough idle and reduced fuel efficiency.

Common Causes for P0133:

  1. Faulty O2 Sensor: The most common cause. Over time, O2 sensors can become contaminated or simply wear out, leading to slow response times.
  2. Exhaust Leaks: An exhaust leak upstream of the O2 sensor can introduce unmetered air, causing the sensor to read incorrectly.
  3. Wiring/Connector Issues: Damaged, corroded, or loose wiring/connectors to the O2 sensor can disrupt its signal.
  4. Fuel System Issues: Problems like a clogged fuel injector or low fuel pressure can affect the air/fuel ratio, which the O2 sensor then reports as 'slow response' due to the engine struggling to maintain stoichiometry.
  5. Contamination: Silicone-based sealants or certain fuel additives can contaminate the O2 sensor, impairing its function.

Troubleshooting Steps:

  1. Visual Inspection: Check the O2 sensor's wiring and connector for any visible damage, fraying, or corrosion. Also, inspect the exhaust system for any leaks near the Bank 1 Sensor 1 location.
  2. Clear the Code: After inspection, clear the P0133 code and drive the truck to see if it returns. Sometimes, it can be a temporary glitch.
  3. Professional Diagnosis: While the code points directly to the O2 sensor, it's wise to have a professional confirm the diagnosis. They can use a scan tool to monitor live O2 sensor data (voltage fluctuations) to verify if it's truly slow or if another underlying issue is affecting its readings.

When to See a Shop: If the code returns after clearing, or if you're uncomfortable with DIY diagnostics or replacement, it's best to take your Ram to a qualified mechanic. Replacing an O2 sensor can sometimes be challenging due to rust or tight spaces. A professional can ensure the correct sensor is installed, check for underlying issues, and prevent potential damage to other exhaust components or wiring during replacement. Ignoring a slow O2 sensor can lead to long-term issues with catalytic converter efficiency and continued poor fuel economy.

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