Engine & fuel system
4 documented faults — symptoms, causes and workshop fixes.
Alternator warning lamp illuminated
Overview
- Affects
- All models with 1KR-FE engine code and stop-start system, →04/05/17.
- Remedy
- Fit modified part
Symptoms
Possible trouble codes stored in engine control module (ECM) fault memory: P162B, P161A.
Cause
Internal fault with alternator.
Repair
- Carry out electrical, mechanical and component tests (as applicable) to eliminate any other possible cause(s).
- If no fault(s) found: Fit modified alternator.
Data: Motorwise Workshop. Bulletin 5.
Abnormal noise from engine cooling system when decelerating between 3200-3500rpm
Cause
Thermostat incorrectly manufactured.
Repair
- Fit modified thermostat.
Parts1 part
| Part | Part number | Qty |
|---|---|---|
| Thermostat | 90916-03153 | 1 |
Data: Motorwise Workshop. Bulletin 6.
Engine malfunction indicator lamp (MIL) illuminated. Trouble code stored: P0011
Cause
Repair
- Fit modified camshaft position (CMP) actuator.
Parts1 part
| Part | Part number | Qty |
|---|---|---|
| Camshaft position (CMP) actuator | 15330-0Q021 | 1 |
Data: Motorwise Workshop. Bulletin 7.
Engine malfunction indicator lamp (MIL) illuminated. Possible trouble codes stored: P0139, P0141, P0140
Overview
- Affects
- All models with 1KR-FE engine code, →06/16.
- Fault codes
P0139P0141P0140- Remedy
- Fit modified part
- Parts
- 2 parts
Cause
Heated oxygen sensor (HO2S) 2 internal damage due to engine control module (ECM) software fault.
Repair
- Fit modified heated oxygen sensor (HO2S).
- Re-program ECM with upgraded software. Note: To carry out an effective repair a software upgrade will be required - refer to manufacturer.
Parts2 parts
| Part | Part number | Qty |
|---|---|---|
| Heated oxygen sensor (HO2S) (Aygo) | 89465-0H050 | 1 |
| Heated oxygen sensor (HO2S) (Yaris) | 89465-0D240 | 1 |
Data: Motorwise Workshop. Bulletin 8.
Electrical & ignition
1 documented fault — symptoms, causes and workshop fixes.
Condensation in rear lamps
Cause
Poor manufacture of rear lamps.
Repair
- Replace rear lamps as required.
Parts4 parts
| Part | Part number | Qty |
|---|---|---|
| RH rear lamp (LHD) | 81551-0H250 | 1 |
| LH rear lamp (LHD) | 81561-0H250 | 1 |
| RH rear lamp (RHD) | 81551-0H250 | 1 |
| LH rear lamp (RHD) | 81561-0H260 | 1 |
Data: Motorwise Workshop. Bulletin 2.
Steering
1 documented fault — symptoms, causes and workshop fixes.
Knocking noise when turning steering wheel
Overview
- Affects
- All models, →02/15.
- Remedy
- Fit modified part
Cause
Unsatisfactory design of steering column.
Repair
- Carry out electrical, mechanical and component tests (as applicable) to eliminate any other possible cause(s).
- If no fault(s) found: Fit modified steering column.
Data: Motorwise Workshop. Bulletin 9.
Body & trim
2 documented faults — symptoms, causes and workshop fixes.
Tailgate will not open from outside
Overview
- Affects
- All models, →07/16.
- Remedy
- Fit modified part
Cause
Tailgate lock mechanism faulty.
Repair
- Fit modified tailgate lock mechanism.
- Fit modified tailgate latch.
Data: Motorwise Workshop. Bulletin 1.
Abnormal noise when opening/closing front doors
Cause
Front door check strap retaining bolt loose.
Repair
- Fit modified door check strap retaining bolt.
Parts1 part
| Part | Part number | Qty |
|---|---|---|
| Retaining bolt | 90119-W0230 | As required |
Data: Motorwise Workshop. Bulletin 3.
Other
1 documented fault — symptoms, causes and workshop fixes.
Bluetooth intermittent operation or not working in high ambient air temperatures
Overview
- Affects
- All models.
- Remedy
- Software update
Cause
Audio unit software fault.
Repair
- Carry out electrical, mechanical and component tests (as applicable) to eliminate any other possible cause(s).
- If no fault(s) found: Re-program audio unit with upgraded software. Note: To carry out an effective repair a software upgrade will be required - refer to manufacturer.
Data: Motorwise Workshop. Bulletin 4.
Glossary
Technical terms used in this guide.
- ECM
- Engine control module — the electronic unit that manages the engine
- Trouble Codes
- Standardised fault codes stored by the engine control module, read with a diagnostic tool
- CMP
- Camshaft position — a sensor that tells the engine control module where the camshaft is
- Actuator
- A motor or solenoid that moves a mechanical part on command
- Control Module
- A control unit for one of the vehicle's systems (engine, gearbox, brakes, body, and so on)
- Fault Memory
- The list of stored trouble codes in a control module
- Re-Program
- Update the software on a control module using the manufacturer's diagnostic tool
- Stop-Start
- The system that cuts the engine at idle and restarts it when you pull away
- Alternator
- The unit that charges the battery while the engine is running
Frequently asked questions
What are the common faults with the Toyota Aygo 1.0 VVTi?
This guide contains nine workshop bulletins for the Toyota Aygo 1.0 VVTi. Of these, four concern the engine and fuel system and two the body and trim. Symptoms, causes, repair steps and part numbers are shown where supplied.
Does every Toyota Aygo 1.0 VVTi have these faults?
No. These are patterns documented across the model by workshops, not predictions for an individual vehicle. Where a fault applies only to certain vehicles or VIN ranges, that is listed with the fault.
Can I check for Toyota Aygo 1.0 VVTi faults myself?
Many of them. The documented symptoms can be seen, heard or felt during a test drive.