2018 INFINITI Q70

The 2018 INFINITI Q70 is a mid-size luxury sedan offering a blend of performance and comfort. It was available with two engine options: a 3.7-liter V6 producing 330 horsepower and 270 lb-ft of torque, and a 5.6-liter V8 delivering 420 horsepower and 417 lb-ft of torque. Both engines were paired with a 7-speed automatic transmission. Owners generally appreciate the Q70’s spacious interior, comfortable ride, and powerful engine options. Some common complaints include the dated infotainment system, smaller-than-average trunk space, and the lack of some advanced safety features compared to newer competitors.

Engine

3.7L V6

• Oil Leaks
  • Description/Symptoms: Oil leaks can develop from various locations, including valve cover gaskets and the front timing cover. Symptoms include visible oil leaks, oil spots under the car, and a burning oil smell.
  • Solution: Replacing the leaking gasket or resealing the affected area.
  • Estimated Cost to Fix: $200 - $800+ depending on the location and severity of the leak.
  • Recalls: None Found

5.6L V8

• Fuel Injector Failure
  • Description/Symptoms: Rough idling, misfires, decreased fuel economy, and a check engine light are symptoms of fuel injector failure.
  • Solution: Replacing the faulty fuel injector(s).
  • Estimated Cost to Fix: $200 - $600+ depending on the number of injectors replaced.
  • Recalls: None Found

Transmission

7-Speed Automatic (Both Engine Options)

• Rough Shifting
  • Description/Symptoms: Harsh or jerky shifts, especially between certain gears, and delayed engagement.
  • Solution: Transmission fluid flush, software update, or in more severe cases, valve body replacement or transmission rebuild.
  • Estimated Cost to Fix: $150 - $300+ for a fluid flush, $100 - $200+ for a software update, $800 - $2500+ for valve body or transmission work.
  • Recalls: None Found

Suspension

• Premature Bushing Wear
  • Description/Symptoms: Clunking noises from the suspension, especially over bumps, and loose or wandering steering.
  • Solution: Replacing the worn bushings in the control arms, sway bar links, and other suspension components.
  • Estimated Cost to Fix: $200 - $800+ depending on the number and location of the bushings replaced.
  • Recalls: None Found

Electrical

• Infotainment System Issues
  • Description/Symptoms: Freezing, lagging, unresponsive touchscreen, Bluetooth connectivity problems, and navigation malfunctions.
  • Solution: Software update, replacement of the head unit, or repair of the wiring harness.
  • Estimated Cost to Fix: $100 - $300+ for a software update, $500 - $1500+ for head unit replacement.
  • Recalls: None Found
• Sensor Failures (e.g., Crankshaft, Camshaft, Oxygen)
  • Description/Symptoms: Check engine light, poor engine performance, stalling, and difficulty starting.
  • Solution: Replacing the faulty sensor.
  • Estimated Cost to Fix: $150 - $500+ depending on the sensor.
  • Recalls: None Found

Exterior

• Automatic Headlight Malfunctions
  • Description/Symptoms: Headlights not turning on automatically when they should, staying on when they should be off, or flickering.
  • Solution: Replacing the headlight sensor or control module.
  • Estimated Cost to Fix: $200 - $600+
  • Recalls: None Found

Interior

• Seat Heater Failure
  • Description/Symptoms: Seat heaters not working, or working intermittently.
  • Solution: Repair or replacement of the heating element or control module.
  • Estimated Cost to Fix: $150 - $500+
  • Recalls: None Found

Summary

The 2018 INFINITI Q70 presents a mix of potential issues, ranging from relatively minor electrical glitches to more significant engine and transmission concerns. While some problems are relatively inexpensive to fix, others, like transmission issues or major engine repairs, can be costly. Potential buyers should be aware of these common problems and carefully inspect the vehicle’s history and condition before purchasing.