What Problems Should You Expect On A 6Th Generation Sentra?
Nissan produced the 6th generation of Sentra from 2007 to 2012. Internally, Nissan refers to this generation of Sentra as the B16. Most examples of this particular generation come with a 2.0 liter 4-cylinder engine with the internal code MR20DE. Nissan and Renault used this engine on various vehicles, but most commonly on the Sentra in the United States.
If you own a 6th generation Sentra or you're planning on buying a used example, then you might be wondering what kinds of repairs you're likely to face. Fortunately, the MR20DE is a relatively reliable engine, but you still might encounter a few issues. Keep these three potential problems in mind for any Sentras of this generation.
1. Failing Engine Position Sensors
Camshaft and Crankshaft position sensor problems have plagued numerous Sentras, including 6th generation models. These sensors allow the car's computer to determine the position of both the crankshaft and camshaft, both of which are necessary for proper timing and ignition control. Problems with either sensor can result in poor performance, misfiring, and stalls.
While this problem won't usually cause any additional damage to your engine, it can leave you stranded. Failing sensors will usually trigger a check engine code, so be sure never to ignore a check engine light and always read the stored trouble codes as soon as possible.
2. Bad Ignition Coils
The MR20DE uses a coil-on-plug design instead of the traditional distributor with spark plug wires. Each cylinder has its own ignition coil, which sits on top of the spark plug. These coils deal with high voltage and high heat, making them particularly prone to failure. Unfortunately, the coils used on the MR20DE may have an even higher failure rate than on other vehicles.
Faulty ignition coils produce similar symptoms to worn-out spark plugs. You'll usually notice misfiring and a rough idle, and the defective coil will eventually lead to a check engine code.
3. Mass Air Flow Sensor Failures
Mass airflow (MAF) sensors are another common failure point on these vehicles. The MAF sensor measures the air entering the engine, allowing the computer to adjust fuel input and maintain the correct stoichiometric ratio. A failing sensor essentially allows unmetered air into the engine, leading to many performance and efficiency issues.
A MAF sensor won't always trigger a check engine, or it may trigger seemingly unrelated codes such as lean running conditions. If your Sentra is stuttering or suffering from a poor idle, you may need a mechanic to check your vehicle and determine if the MAF sensor may be to blame.
For more information, reach out to an auto service like Western Avenue Nissan.