Engine & fuel system
1 documented fault — symptoms, causes and workshop fixes.
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 1.
Electrical & ignition
1 documented fault — symptoms, causes and workshop fixes.
Rattling/clicking noise from partially open window whilst driving
Cause
Poor manufacture of window winder mechanism.
Repair
- Fit modified window winder mechanism(s)as necessary.
Parts8 parts
| Part | Part number | Qty |
|---|---|---|
| Front window winder mechanism - RH (→01/23) | 69810-02721 | 1 |
| Front window winder mechanism - LH (→01/23) | 69820-02741 | 1 |
| Rear window winder mechanism - RH (→01/23) | 69830-02681 | 1 |
| Rear window winder mechanism - LH (→01/23) | 69840-02681 | 1 |
| Front window winder mechanism - RH (01/23→) | 69810-02722 | 1 |
| Front window winder mechanism - LH (01/23→) | 69820-02742 | 1 |
| Rear window winder mechanism - RH (01/23→) | 69830-02682 | 1 |
| Rear window winder mechanism - LH (01/23→) | 69840-02682 | 1 |
Data: Motorwise Workshop. Bulletin 3.
Suspension & drivetrain
1 documented fault — symptoms, causes and workshop fixes.
Knocking noise from front suspension when driving over rough roads or speed humps
Cause
Unsatisfactory design of front anti-roll bar bushes.
Repair
- Fit modified front anti-roll bar bushes.
Parts1 part
| Part | Part number | Qty |
|---|---|---|
| Front anti-roll bar bush | 48815-10130 | 2 |
Data: Motorwise Workshop. Bulletin 2.
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
- Anti-Roll Bar
- A bar that links the left and right suspension to cut body roll in corners
- Control Module
- A control unit for one of the vehicle's systems (engine, gearbox, brakes, body, and so on)
- 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
- Bushes
- Rubber mountings that let a suspension or body joint move without metal-to-metal contact
Frequently asked questions
What are the common faults with the Toyota Corolla 1.2 Turbo?
This guide contains three workshop bulletins for the Toyota Corolla 1.2 Turbo. Of these, one concerns the engine and fuel system and one the electrical and ignition. Symptoms, causes, repair steps and part numbers are shown where supplied.
Does every Toyota Corolla 1.2 Turbo 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 Corolla 1.2 Turbo faults myself?
Many of them. The documented symptoms can be seen, heard or felt during a test drive.