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503-293-5386 | 7310 S Macadam Ave Portland, OR 97219

Check Engine Light On? Could Be A Faulty O2 Sensor

Check Engine Light On? Could Be A Faulty O2 Sensor

Car Care Check Engine Light Advice

According to the annual CarMD Vehicle Health Index one of the most common check engine light repairs is replacing the oxygen sensor. This relatively minor repair can be costly if neglected, leading to as much as 40 percent lower fuel efficiency, causing further damage to your vehicle's exhaust system and adversely impacting the environment.

Vehicles with faulty oxygen sensors typically seem to drive and handle well, but the malfunction can dramatically decrease fuel efficiency and lead to costlier repairs if ignored. A faulty oxygen sensor means your vehicle is emitting more pollutants and if the check engine light is illuminated, it may not pass vehicle emissions testing in those states requiring it for vehicle registration.

A vehicle's oxygen sensors are mounted in the exhaust system; they monitor the catalytic convertor's operation and the level of oxygen in exhaust gases to maintain efficient engine operation. The best way to prevent an oxygen sensor failure is to follow a regular service schedule, including routine oil changes.

Unlike the past nine years of the annual CarMD report, costly catalytic converter replacement edged out O2 sensor replacement as the most common check engine light repair. Catalytic converters do not typically fail unless maintenance and other repairs are ignored or the vehicle is older. Average vehicle age has increased from 10.6 years to 11.7 years over the past decade, contributing to this outcome.

It is important that car owners check the reason for an illuminated check engine light without delay and make necessary maintenance to avoid more costly repairs, like catalytic converter replacement, down the road. If you find your vehicle needs service, call your trusted local repair shop.

Source: Car Care Council


General Recall Info

Takata Recall Info


What Our Customers Are Saying

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You Guys Kick arse!! Thank for the work you do!! The power from 3K to 5K has improved and it has a quicker response. Great upgrade for the money!! Thaank you!!

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Marque Motors was recommended to me by several of my 'German Sport car owning' friends. Kurt was very generous with his time to help me understand the differences of the cars that I am researching to purchase (Porsche vs. Audi). He gave me some excellent pointers that I would not have thought about before pursuing a purchase. I will definitely bring the car to Marque for a full pre-purchase inspection when I identify it, and any service and repairs as well. I believe they are an excellent resource!

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I've taken a number of Porsches to Kurt over the past 15 years or so. They do careful work, give great advice, and have been very reasonably priced.

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I was recommended Marque Motors for a pre-purchase inspection on a Porsche Boxster in Portland. I don't live in the area and hadn't actually seen the car myself, so the inspection was really important to me. Kurt was great and gave me all the information I needed to make an informed purchase, taking time to explain the report details over the phone and answering any questions I had. The inspection also cost me less than I was originally quoted which was nice! If I was anywhere near the area, I'd definitely be going back to Marque Motors for any work my car might need in the future.

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We have been doing business with Marque Motors for a long time, this is a quality shop. All my customers that drive Porsches, BMWs, and Audis take their cars here and have nothing but GREAT things to say about their work. Kurt has a very good reputation and his staff knows what they are doing. Marque Motors is a full-service repair facility specializing in Porsche, Audi, BMW, MINI and Volkswagen. NOTE: SERVICE & REPAIR FACILITY SPECIALIST ! Service and Repair Shops that have been around a while are getting harder to find, this is one of the good ones. We are in the industry and my customers say this is a great shop, and I agree.

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Kurt and crew always have done what they say, when and for the amount agreed to. They serviced our 1999 Audi A4 for the last 13 years, and I would use them again, and recommend them highly.

  • Bosch Certified Service Center
  • ASE (Automotive Service Excellence)
  • World Pac
  • ALL-DATA
  • BG Products
  • Interstate Batteries
  • Total Oil
  • ORPCA (Oregon Porsche Club of America)
  • DEQ Too
  • Car Care Aware
  • Call Us For Service: 503-293-5386