Your 2021 Acura TLX has developed an unsettling vibration at idle, and a scan confirms P0302—Cylinder 2 Misfire Detected. This specific code gives you a clear starting point for diagnosis, allowing targeted investigation of cylinder 2 components.
Why Idle Vibration Is Noticeable
The TLX's engines are designed for smooth operation. When one cylinder stops contributing properly, the engine's balance is disrupted. At idle, where there's no momentum to mask irregularities, this imbalance becomes immediately noticeable through the steering wheel, seats, and overall cabin.
TLX Engine Options
The 2021 TLX offers:
- 2.0L Turbo Four-Cylinder: Found in standard models
- 3.0L Twin-Turbo V6: Type S model
Cylinder 2 location differs between these engines, but the diagnostic approach remains similar.
Common Causes of Cylinder 2 Misfire
Single-cylinder misfires typically stem from:
- Ignition coil failure - Each cylinder has its own coil
- Spark plug degradation - Fouling, damage, or wear
- Fuel injector malfunction - Clogging or electronic failure
- Low compression - Valve or gasket issues
- Carbon buildup - Direct injection deposits
- Wiring problems - Damaged connections to cylinder 2
The Swap Test
For ignition-related problems:
- Note current code: P0302 (Cylinder 2)
- Swap cylinder 2 ignition coil with another cylinder
- Clear fault codes
- Drive until check engine light returns
- If the misfire moves, the coil is faulty
Turbo Engine Considerations
On the turbocharged models, also consider:
- Boost leaks affecting specific cylinder filling
- Injector issues from high-pressure direct injection
- Carbon deposits more common on direct-injection engines
Repair Costs
- Ignition coil (single): $80-$200
- Spark plugs (set): $150-$300
- Fuel injector: $350-$650
- Carbon cleaning: $400-$800