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Check Engine Light P0133 on 2016 Q60 - O2 Sensor Issue?

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Mike T. · rep 0 · May 25, 3:49 AM · 1 replies · solved · Question

Vehicle: 2016 Infiniti Q60 3.7L

My 2016 Infiniti Q60 3.7L has the Check Engine Light on, and when I scanned it, I got code P0133. This indicates an O2 Sensor Circuit Slow Response (Bank 1 Sensor 1). The car seems to be running okay, but I've noticed a slight dip in my fuel economy.

Is this something I can tackle myself, or should I take it straight to a mechanic? What are the implications of driving with this code, and could it be something other than the sensor itself?

I'm hoping it's not a major issue, but the reduced MPG is starting to add up.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:49 AM

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ClearTheCode admin answer:

  1. Understand P0133: This code means the upstream oxygen sensor (Bank 1 Sensor 1, located before the catalytic converter on the side of the engine with cylinder #1) is not responding quickly enough to changes in the exhaust gas composition. This sensor is crucial for the engine's computer (ECM) to adjust the air/fuel mixture for optimal performance and emissions.
  2. Common Causes:
    • Faulty O2 Sensor: The most common cause. Sensors wear out over time due to heat, carbon buildup, and contaminants.
    • Exhaust Leaks: Leaks near the sensor can introduce outside air, skewing readings and making the sensor appear slow.
    • Wiring/Connector Issues: Damaged, corroded, or loose wiring to the sensor can prevent proper signal transmission.
    • Contamination: Fuel additives, silicone sealants (from previous repairs), or oil can foul the sensor, reducing its responsiveness.
    • Engine Performance Issues: Though less common, misfires, fuel pressure problems, or excessive oil consumption can indirectly affect O2 sensor readings.
  3. Implications of Driving with P0133: A slow O2 sensor leads to the ECM using incorrect air/fuel mixture data. This can result in:
    • Reduced fuel economy (as you've noticed).
    • Increased emissions.
    • Subtle poor engine performance (hesitation, rough idle).
    • Potential long-term damage to the catalytic converter if the rich or lean condition is severe and prolonged.

DIY vs. Professional: Replacing an O2 sensor can be a DIY job if you have the right tools (an O2 sensor socket is highly recommended) and good access. However, they can be seized due to heat and rust, making removal difficult. If you're unsure, or if visual inspection of the wiring and exhaust doesn't reveal obvious issues, a professional can properly diagnose and replace it. They can also check for related codes or underlying engine issues. Given the importance of this sensor for engine health and fuel economy, addressing it promptly is advisable.

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