Your 2022 Lexus NX has developed an uncharacteristic vibration, and a diagnostic scan confirms P0302—Cylinder 2 Misfire Detected. This specific code gives you a precise starting point for diagnosis, though the fact that a relatively new Lexus is misfiring warrants thorough investigation.
Understanding the 2022 NX Powertrain
The 2022 NX received a complete redesign with new powertrain options: the NX 250/350 with the 2.4L turbocharged four-cylinder, and the NX 350h/450h+ hybrids. If you have the turbocharged model, the cylinder 2 misfire could stem from issues specific to forced induction engines.
Why Your NX Vibrates During Misfire
Four-cylinder engines are inherently less balanced than six-cylinder designs. When one cylinder stops contributing normally, the imbalance becomes immediately noticeable. At idle, where there's no momentum to mask irregularities, vibration through the steering wheel and seats is pronounced.
Common Causes of Cylinder 2 Misfire
Single-cylinder misfires typically stem from:
- Ignition coil failure - Each cylinder has its own coil-on-plug unit
- Spark plug issues - Fouling, damage, or improper gap
- Fuel injector malfunction - Direct injectors can clog or fail electrically
- Low compression - Valve or gasket problems
- Carbon buildup - Common on direct-injection engines over time
- Wiring problems - Damaged connections specific to cylinder 2
The Swap Test
For ignition-related diagnosis:
- Record current code: P0302
- Swap cylinder 2 ignition coil with cylinder 4
- Clear fault codes
- Drive until check engine light returns
- If P0304 appears, the coil is faulty
Warranty Consideration
Your 2022 NX should be under the 4-year/50,000-mile basic warranty. Unless spark plugs are found to be the cause (typically considered maintenance items), component failures should be covered.
Repair Costs If Out of Warranty
- Ignition coil (single): $100-$200
- Spark plugs (set): $150-$300
- Fuel injector: $400-$700
- Compression test: $100-$200