A P0171 code is common, which means there is too much air in the fuel/air mixture. The first thing you may notice is your engine running a little bit rough, or perhaps not having as much power as you expect. What Happens If You Don’t Replace the MAF Sensor? It may also be possible to clean your mass air flow sensor instead of replacing it, but it takes the same amount of time to remove and replace it, so your mechanic will likely just replace it to be sure it’s fixed. Once the mechanic has the part, it shouldn’t take them more than an hour of work to replace it, so your car should be in and out of the shop on the same day. This gives the ECM inaccurate information and causes an incorrect fuel/air mixture. Sometimes this sensor can get clogged with debris or fail entirely. This enables the ECM (the computer that runs the engine) to calculate and add the proper amount of fuel. The mass air flow sensor (MAF) measures how much air goes into your engine. Your engine requires a precise mixture of fuel and air in order to run at maximum power and efficiency. ![]() Also, even if cleaning the sensor doesn’t solve your problem, now you’ll know how to find it, remove it, and replace it yourself. ![]() For the minimal cost, it’s well worth trying to clean it before you replace it. But sometimes the sensor is just dirty, and you can fix it yourself with just a $10 can of cleaner. Upon diagnosing a mass air flow sensor problem, a mechanic will typically replace it to make sure the problem is fixed properly the first time. ![]() ![]() However, you can save even more money by troubleshooting the problem yourself.
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