![]() ![]() The labor time is 1.6 hours, and OE spark plugs cost about $10 each. On a 2010 Dodge Charger with a 5.7 liter V-8, for instance, there are two spark plugs per cylinder, for a total of 16 plugs, and access is restricted on 4 of them. For an eight cylinder engine, the average cost is about $360. For a six cylinder engine, the average cost is about $400 (often requiring the removal of an intake plenum). Using $150 an hour as a typical shop rate, for a four cylinder engine, the average cost to replace the spark plugs is about $198. The cost of replacing spark plugs depends on several things, including how many spark plugs there are. Some of the more convenient ones plug into the OBDII port under the dash and use Bluetooth to pair with a smartphone. Any auto shop can read codes many auto parts stores will also read engine codes if asked and it’s fairly inexpensive for anyone to buy a code reader. Many things can cause an engine light, and you don’t know what the reason is until the code is read. A flashing check engine light usually indicates a problem bad enough that the vehicle shouldn’t be driven. In most cases, it will also cause the check engine light to come on, as the PCM monitors the ignition system pretty closely.Ī solid engine light is usually best checked as soon as possible. That is usually first felt at idle, when it will appear as a rough-running engine, and sometimes the exhaust can smell like raw fuel. If left too long, they can become fouled or fail to ignite the fuel mixture at all intermittently, which causes a misfire. When spark plugs are near the end of their lifespan, they can fire less efficiently and impact fuel mileage. ![]()
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