P0300 on Lincoln
Random/Multiple Cylinder Misfire Detected
P0300 on Lincoln vehicles indicates random/multiple cylinder misfire detected. Au7o has documented this code across 2 Lincoln models — most commonly on MKZ, Navigator. P0300 means the engine computer detected misfires occurring randomly or across multiple cylinders rather than in one specific cylinder. A misfire is when a cylinder fails to ignite its fuel-air mixture properly, which the computer senses through small fluctuations in crankshaft speed. Because it's not isolated to one cylinder, the cause is usually something that affects the whole engine — like fuel, air, or ignition system problems — rather than a single coil or plug. Persistent or heavy misfiring wastes fuel, runs rough, and can damage the catalytic converter, which is why a flashing check engine light should be taken seriously. Typical repair costs on Lincoln range from $300 to $15,000, depending on the specific model and root cause.
Common Causes of P0300
- •Worn or fouled spark plugs (across cylinders)
- •Vacuum or intake air leak
- •Weak fuel pump, clogged fuel filter, or low fuel pressure
- •Failing ignition coils or worn spark plug wires
- •Dirty or faulty mass airflow (MAF) sensor
- •Clogged or dirty fuel injectors
- •Faulty crankshaft/camshaft position sensor
- •Low compression or EGR/PCV system faults
P0300 on Lincoln by Model
Lincoln MKZ(1 issue)
- 2.0L EcoBoost Internal Coolant Leak / Coolant Intrusion into Cylinders2013-2020
Second-generation MKZ models equipped with the 2.0L EcoBoost turbo engine can develop an internal coolant leak where coolant seeps from the cooling jacket into a combustion chamber, commonly cylinder 2. This is attributed to a cylinder head/block design and sealing defect. Burned coolant causes misfires, white exhaust smoke, chronically low coolant with no external leak, and in severe cases overheating and complete engine failure. The defect is the subject of a Ford EcoBoost coolant-intrusion class action.
Lincoln Navigator(3 issues)
- Navigator 5.4L 3V Triton Spark Plug Breakage on Removal2005-2008
The 5.4L 3-valve Triton V8 in 2005-2008 Navigator (and shared F-150/Expedition) uses a two-piece spark plug (Motorcraft SP-515/SP-546) that frequently snaps off in the cylinder head during removal. The lower portion stays welded into the head by carbon, leaving the upper electrode in the socket. Common at 60,000-100,000 miles when the first plug change is attempted.
- Navigator 3.5L EcoBoost Timing Chain Stretch2015-2019
The 3.5L EcoBoost twin-turbo V6 in 2015+ Navigator (and shared F-150, Expedition, Edge ST) suffers timing chain stretch typically between 80,000-150,000 miles. Symptoms include a rattling noise on cold start, particularly on the passenger-side bank, plus P0016/P0017/P0018/P0019 correlation codes. Causes include extended oil change intervals, low-quality oil, and turbocharger-related oil shear.
- 5.4L 3-Valve Triton Spark Plugs Seize and Break in Cylinder Head2005-2008
Second- and third-generation Navigators with the 5.4L 3-valve Triton V8 use a unique two-piece spark plug whose long electrode shell extends below the threads. Carbon deposits cake into the gap over high mileage, gripping the plug so tightly that the shell breaks off during removal, leaving a portion seized inside the aluminum cylinder head. This turns a routine tune-up into a costly extraction job.
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View P0300 across all makes →Frequently Asked Questions
What does P0300 mean on Lincoln?▼
P0300 stands for "Random/Multiple Cylinder Misfire Detected." P0300 means the engine computer detected misfires occurring randomly or across multiple cylinders rather than in one specific cylinder. A misfire is when a cylinder fails to ignite its fuel-air mixture properly, which the computer senses through small fluctuations in crankshaft speed. Because it's not isolated to one cylinder, the cause is usually something that affects the whole engine — like fuel, air, or ignition system problems — rather than a single coil or plug. Persistent or heavy misfiring wastes fuel, runs rough, and can damage the catalytic converter, which is why a flashing check engine light should be taken seriously. On Lincoln specifically, this code is documented across 2 models.
What causes P0300 on Lincoln vehicles?▼
Common causes on Lincoln: Worn or fouled spark plugs (across cylinders), Vacuum or intake air leak, Weak fuel pump, clogged fuel filter, or low fuel pressure, Failing ignition coils or worn spark plug wires, Dirty or faulty mass airflow (MAF) sensor. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0300 on a Lincoln?▼
Repair costs on Lincoln range from $300 to $15,000, depending on the specific model and root cause.
Which Lincoln models have P0300 documented?▼
Au7o has documented P0300 on 2 Lincoln models: MKZ, Navigator.