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2017 Malibu Check Engine Light - P0135 O2 Sensor Code

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Mike T. · rep 0 · May 25, 1:41 AM · 1 replies · solved · Question

Vehicle: 2017 Chevrolet Malibu LT

My 2017 Chevrolet Malibu LT just threw a Check Engine Light, and when I scanned it, I got a P0135 code. The car seems to be running a bit rough, and I think my fuel economy has dipped slightly. I know P0135 is for the O2 Sensor Heater Circuit (Bank 1 Sensor 1).

What does this code specifically mean for my Malibu? Is this something I can tackle myself, or should I take it straight to a mechanic? I'm worried about potential damage if I keep driving it like this.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 1:41 AM

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ClearTheCode admin answer:

The P0135 diagnostic trouble code in your 2017 Chevrolet Malibu LT indicates an issue with the heater circuit for the upstream oxygen (O2) sensor on Bank 1. This sensor, often referred to as Sensor 1, is located before the catalytic converter and is crucial for the engine's fuel management system.

Understanding P0135:

  • O2 Sensor Function: Oxygen sensors measure the amount of oxygen in the exhaust gases, providing data to the Engine Control Module (ECM) to adjust the air-fuel mixture for optimal combustion and emissions.
  • Heater Circuit: O2 sensors need to reach a high operating temperature quickly to function accurately. The heater circuit inside the sensor helps it warm up fast. P0135 means the ECM has detected a fault in this heating element.

Common Causes for P0135:

  1. Faulty O2 Sensor: The heater element within the sensor itself can burn out or fail.
  2. Wiring Issues: Damaged, corroded, or shorted wiring to the O2 sensor's heater circuit.
  3. Blown Fuse: A fuse protecting the O2 sensor heater circuit could be blown.
  4. ECM Failure: While rare, a fault within the ECM itself could cause this code, though it's usually a last resort diagnosis.

Impact of the Issue:

Without a functional heater, the O2 sensor will take longer to reach operating temperature, leading to the ECM operating in 'open loop' mode for longer. This can result in:

  • Decreased fuel efficiency.
  • Rougher idle or engine performance.
  • Increased emissions.

What You Can Do:

  1. Visual Inspection: Check the O2 sensor (Bank 1 Sensor 1) and its wiring harness for any obvious damage, frayed wires, or loose connections.
  2. Check Fuses: Consult your owner's manual for the location of the fuse related to the O2 sensor heater circuit and check if it's blown.

When to See a Shop:

While replacing an O2 sensor can be a DIY task for some, diagnosing the exact cause of a P0135 code (especially if it's wiring-related) requires specific tools like a multimeter to test continuity and resistance. Driving with a faulty O2 sensor for an extended period can negatively impact your fuel economy and potentially lead to catalytic converter damage over time. It's recommended to have a qualified mechanic diagnose and replace the sensor or repair the wiring to ensure proper engine function and prevent further issues.

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