Engine & fuel system
1 documented fault — symptoms, causes and workshop fixes.
Poor starting from cold
Overview
- Affects
- All models, VIN →0M141249.
- Fault codes
P0330- Remedy
- Software update
Symptoms
Engine malfunction indicator lamp (MIL) illuminated. Trouble codes stored: P011B, P0330.
Cause
Engine control module (ECM) 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 engine control module (ECM) with upgraded software. Note: To carry out an effective repair a software upgrade will be required - refer to manufacturer.
Data: Motorwise Workshop. Bulletin 1.
Suspension & drivetrain
1 documented fault — symptoms, causes and workshop fixes.
Knocking noise from front of vehicle over uneven surfaces
Movement between front shock absorber upper mounting bracket and chassis. Fix: adjust and tighten.
Overview
- Affects
- All models, →03/09/14.
- Remedy
- Adjust & tighten
Repair steps
- Inspect front shock absorber upper mounting bracket for signs of contact with chassis.
- Remove front shock absorber upper mounting bracket.
- Clean front shock absorber upper mounting bracket and chassis contact surfaces.
- Apply adhesive to area indicated.
- Refit front shock absorber upper mounting bracket. Tighten new bolts and nut to correct torque setting.
- Repeat procedure for opposite side.
- Wait at least 6 hours for adhesive to dry before refitting shock absorber.
- Wait at least 24 hours before putting all wheels on ground.
- Check front wheel alignment and adjust if necessary.
Parts
| Part | Part number | Qty |
|---|---|---|
| Adhesive (DP490) | 71777711 | 1 |
Data: Motorwise Workshop. Bulletin 2.
Other
1 documented fault — symptoms, causes and workshop fixes.
Rattling/knocking noise from front of vehicle when driving over rough roads
Movement between front anti-roll bar mounting brackets and vehicle body. Fix: clean and lubricate.
Overview
- Affects
- All models, →28/09/15.
- Remedy
- Clean & lubricate
Repair steps
- Remove front anti-roll bar.
- Drill four 5.0 mm holes positioned as shown in front anti-roll bar mounting bracket.
- Thoroughly clean area with cleaner.
- Apply primer coating to area to prevent corrosion.
- Fit rivets to holes.
- Repeat procedure for opposite side.
Parts
| Part | Part number | Qty |
|---|---|---|
| Cleaner (Basf 700-10) | - | 1 |
| Primer (Basf 801-72) | - | 1 |
| Rivets | 50544916 | 8 |
| Anti-roll bar link rod nuts | 50525759 | 2 |
| Anti-roll bar bush clamp bolts | 50526396 | 4 |
Data: Motorwise Workshop. Bulletin 3.
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
- VIN
- Vehicle identification number — 17 characters, found at the base of the windscreen and on the V5C logbook
- Trouble Codes
- Standardised fault codes stored by the engine control module, read with a diagnostic tool
- 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
Frequently asked questions
What are the common faults with the Alfa Romeo 4C 1.75?
This guide contains three workshop bulletins for the Alfa Romeo 4C 1.75. Of these, one concerns the engine and fuel system and one the suspension and drivetrain. Symptoms, causes, repair steps and part numbers are shown where supplied.
Does every Alfa Romeo 4C 1.75 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 Alfa Romeo 4C 1.75 faults myself?
Many of them. The documented symptoms can be seen, heard or felt during a test drive.