Oxygen sensors monitor the air-to-fuel ratio in your exhaust stream, feeding real-time data to your engine control module (ECM). This allows the system to adjust fuel delivery for maximum efficiency and clean combustion.

When a sensor fails or drifts out of calibration, the ECM can no longer maintain proper air-fuel balance — leading to increased fuel consumption, rough running, or catalytic converter damage.

Common symptoms of bad O₂ sensors include:

• Check engine light with P0130–P0167 codes
• Poor fuel economy
• Rough idle or hesitation
• Failed emissions test
• Black exhaust smoke or sulfur odor

At The Garage MKG, we don’t replace parts based on codes alone — we test them. Using OEM-level scan data and oscilloscope waveforms, our technicians evaluate sensor response time, voltage range, and heater circuit operation before recommending replacement.

When replacement is necessary, we use only high-quality OEM or OE-equivalent sensors to ensure accuracy and longevity. Our service includes:

• Pre- and post-cat sensor evaluation
• Circuit and ground testing
• Safe removal and installation using anti-seize and torque specifications
• Emissions readiness verification after replacement

You’ll know exactly what we found and why replacement was required — backed by data, not guesswork.

A properly functioning oxygen sensor keeps your catalytic converter healthy by maintaining ideal air-fuel balance. Replacing worn or lazy sensors not only improves fuel economy and throttle response but also prevents damage to expensive exhaust components.

We’ll ensure your sensors are communicating properly with your engine’s control system and provide ongoing maintenance recommendations based on your vehicle’s mileage and service history. Every inspection and test result is documented in your Complete Vehicle Health Report for transparency and future reference.

If your check engine light is on or your fuel economy has dropped, schedule oxygen sensor diagnostics and replacement with The Garage MKG today. Call (231) 246-7735, visit 1860 Henry St, Muskegon, MI, or book online anytime.

Our team will accurately test, verify, and replace only what’s needed — restoring clean performance and protecting your catalytic converter for miles to come.