Engine & fuel system
3 documented faults — symptoms, causes and workshop fixes.
Abnormal noise from engine bay while driving
Symptoms
Possible trouble code stored in engine control module (ECM) fault memory: P0243.
Cause
Turbocharger (TC) wastegate regulating valve faulty.
Repair
- Renew turbocharger (TC) wastegate regulating valve.
Parts1 part
| Part | Part number | Qty |
|---|---|---|
| Turbocharger (TC) wastegate regulating valve | 25819-0W010 | 1 |
Data: Motorwise Workshop. Bulletin 2.
Lack of power
Overview
- Affects
- All models with 8NR-FTS engine code and stop-start, →24/07/18.
- Fault codes
P0300P0301P0302P0303P0304- Remedy
- Software update
- Parts
- 1 part
Symptoms
Engine malfunction indicator lamp (MIL) illuminated. Possible trouble code(s) stored: P0300, P0301,P0302, P0303, P0304.
Cause
Engine control module (ECM) software fault.
Faulty ignition coil(s).
Repair
- Inspect production number on ignition coil If production number before 8208, replace ignition coil.
- Re-program ECM with upgraded software. Note: To carry out an effective repair a software upgrade will be required - refer to manufacturer.
Parts1 part
| Part | Part number | Qty |
|---|---|---|
| Ignition coil | 90919-02271 | As required |
Data: Motorwise Workshop. Bulletin 3.
Abnormal noise in area of bulkhead
Overview
- Affects
- All models with 8NR-FTS engine code, →01/18.
- Remedy
- Fit modified part
- Parts
- 2 parts
Cause
Turbocharger (TC) wastegate regulating valve vibrating due to vacuum pressure fluctuations.
Repair
- Fit modified turbocharger (TC) wastegate regulating valve vacuum pipe.
- Fit additional vacuum pipe retaining clip as shown.
Parts2 parts
| Part | Part number | Qty |
|---|---|---|
| Vacuum pipe | 25781-47030 | 1 |
| Retaining clip | 23841-28050 | 1 |
Data: Motorwise Workshop. Bulletin 5.
Brakes
1 documented fault — symptoms, causes and workshop fixes.
Rattling noise from front brakes over uneven surfaces
Cause
Unsatisfactory design of front brake caliper carrier.
Repair
- Fit modified front brake caliper carriers.
Parts1 part
| Part | Part number | Qty |
|---|---|---|
| Front brake caliper carrier | 47721-09560 | As required |
Data: Motorwise Workshop. Bulletin 1.
Body & trim
1 documented fault — symptoms, causes and workshop fixes.
Knocking noise when opening/closing front doors
Unsatisfactory design of front door check strap. Fix: fit a modified part.
Overview
- Affects
- All models, →10/16.
- Remedy
- Fit modified part
Repair steps
- Remove and discard front door check strap.
- Apply thread locking compound to door check strap retaining bolt.
- Fit modified door check strap.
- Tighten door check strap bolts to correct torque setting.
- Apply a light coating of grease to moving parts of door check strap mechanism.
- If necessary, repeat procedure for opposite side.
Parts
| Part | Part number | Qty |
|---|---|---|
| Door check strap | 68610-02241 | 1 |
Data: Motorwise Workshop. Bulletin 4.
Glossary
Technical terms used in this guide.
- MIL
- Malfunction indicator lamp — the engine warning light on the dashboard
- ECM
- Engine control module — the electronic unit that manages the engine
- TC
- Turbocharger — the exhaust-driven compressor that boosts engine power
- Caliper
- The part that squeezes the brake pads onto the disc
- 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
- Trouble Code
- A standardised fault code stored by a control module, read with a diagnostic tool
- Wastegate Regulating Valve
- The valve that controls the turbocharger's wastegate, and so the boost pressure
Frequently asked questions
What are the common faults with the Toyota Auris 1.2 T VVTi?
This guide contains five workshop bulletins for the Toyota Auris 1.2 T VVTi. Of these, three concern the engine and fuel system and one the brakes. Symptoms, causes, repair steps and part numbers are shown where supplied.
Does every Toyota Auris 1.2 T 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 Auris 1.2 T VVTi faults myself?
Many of them. The documented symptoms can be seen, heard or felt during a test drive.