IsItAGoodCar
Reliability Guide

Common Problems with the
2020 Honda Jazz Mk4

The Mk4 Jazz launched in the UK exclusively as a hybrid, representing the model's complete transition to electrification. The e:HEV powertrain proved reliable and economical, though the 12V battery could drain if left unused.

What changed for 2020

  • •UK launch of fourth-generation Jazz
  • •Hybrid-only powertrain with e:HEV system
  • •Magic Seats retained for class-leading practicality
  • •Significantly higher quality interior

Common MOT watch-outs

  • !12V battery drain if car sits unused
  • !Brake simulator sensor recall for 2020-2021 cars
  • !Software and ADAS glitches requiring updates
4
Known Issues
1
Serious
0
Moderate
3
Minor

All Known Issues

Brake Simulator Pressure Sensor Fault

SeriousBrakes

A recall was issued for affected Jazz Mk4s due to a faulty brake operating simulator pressure sensor, which can affect brake feel and safety system operation.

Est. Repair Cost: £0
Warning Signs:

Unusual brake pedal feel, Brake system warning lights, Potential loss of brake assist

What to Inspect:
  • Check recall status with Honda dealer
  • Verify if the brake simulator has been replaced
Verified by IsItAGoodCar Research Team

Software and ADAS Glitches

MinorElectrics & Electronics

Occasional glitches with the digital dashboard or safety sensors (ADAS) can occur, usually resolved by dealer software updates.

Est. Repair Cost: £0
Warning Signs:

Random warning lights, Infotainment freezing

What to Inspect:
  • Check for recent software update records
Verified by IsItAGoodCar Research Team

12V Battery Drain

MinorElectrics & Electronics

Like the Mk3, the 12V battery can drain if the car is left unused for extended periods.

Est. Repair Cost: £100–£180
Warning Signs:

Car fails to start/ready

What to Inspect:
  • Verify battery health
Verified by IsItAGoodCar Research Team

Air Conditioning Faults

MinorCooling System

A small number of Jazz Mk4s experience occasional air conditioning issues, including leaks from pipe seals or condenser problems.

Est. Repair Cost: £78–£500
Warning Signs:

A/C blows warm air, Reduced cooling performance, Hissing from dashboard area

What to Inspect:
  • Test A/C at full cold
  • Check for refrigerant leaks
  • Verify compressor operation
Verified by IsItAGoodCar Research Team

Buying Tips for 2020 Honda Jazz Mk4

  • ✓Ensure all software updates have been applied—these are critical for the hybrid system and ADAS safety features.
  • ✓Check the 12V battery if the car has been sitting unused; it can drain and cause non-starts.
  • ✓Verify a full Honda main-dealer service history to maintain the 10-year hybrid battery warranty.
  • ✓Test the air conditioning at full cold; condenser leaks are a known minor issue on early examples.
  • ✓Inspect the paintwork for stone chips—Honda's finish is thin and the Jazz's flat front end catches debris.
  • ✓Check the GOV.UK recall database for the brake simulator sensor recall affecting some 2020–2021 models.
2021
Check a 2020 Honda Jazz Mk4 by Registration