Having carried out the road test

See table S015 NOISE WHILST DRIVING

there was a knocking noise from the front.

Continue depending on the circumstances in which the noise occurs.

1. The noise disappears when the brake pedal is operated

2. The noise occurs whilst accelerating or braking with the wheels steered.

3. The noise only occurs during acceleration or braking

4. The noise is also present in other conditions.

1. Restore the correct tightening of the front brake calipers to the steering knuckle.

2. Replace the wheel bearing on the side where the fault occurred

Op. 4450C32 ONE FRONT WHEEL HUB BEARING, LH OR RH - REPLACE

fitting it with the magnetic track facing the steering knuckle seal

This bearing is used by the ABS active sensors to calculate the wheel speed. It should NEVER come into contact with metal shavings or magnetic components (screwdrivers, etc.) because they could alter the gap or damage the codifier and prevent a correct reading from the sensor.

3. Move on to Step 1

4. Move on to Step 1

1. The buffer plate is loose

2. There is contact between the rubber part of the plate and the bodyshell.

1. Tighten the upper nut to torque so that the buffer plate does not move any more.

2. Place a shim no larger than 2.5 mm in between.

Raise the vehicle on a two column lift and check that there are no oil leaks from the shock absorber stem.

Slight dampness on the stem is considered normal because there is evaporation during the operation of the shock absorber.

If there is a persistent oil leak on the shock absorber stem, make sure that it is not coming from other parts of the vehicle that are lubricated

1. Leaks from other parts that are lubricated

2. Leaks from the shock absorber stem.

1. Search for the cause of the leak following the appropriate diagnostic procedure.

2. Replace the shock absorber

Op. 4410A12 FRONT SUSPENSION DAMPER (ONE), LH OR RH - FOR MCPHERSON STRUT SYSTEM - INCLUDES DISMANTLING/REASSEMBLY OF ASSEMBLY AT BENCH - R.R

Check that there are no signs of interference between the suspension elements or between the latter and the bodyshell.

In particular, check that there are no signs of wear on the suspension springs and that they do not show signs of abrasion.

If the spring shows signs of abrasion, its mechanical properties could be weakened as a result of oxidation.

1. Inteference due to incorrect fitting.

2. Abrasions or non conformity of the spring.

1. Eliminate the interference and restore the correct fastening. If this is not possible, replace the defective components.

2. Replace the spring

Op. 4410A12 FRONT SUSPENSION DAMPER (ONE), LH OR RH - FOR MCPHERSON STRUT SYSTEM - INCLUDES DISMANTLING/REASSEMBLY OF ASSEMBLY AT BENCH - R.R

taking care to fit it correctly.

Check that there is no clearance between track control arm track rod ends and make sure that the boot is intact.

In order to do so the guard under the engine must be removed

Op. 7055B54 UNDER ENGINE PROTECTION/GUARD - R.R.

then loosen the bolt connecting the track control arm to the front steering knuckle.

Also check the condition of the suspension bushes.

Replace the track control arm

Op. 4410B40 LOWER TRACK CONTROL ARM (WITH BALLJOINT) FOR LEFT OR RIGHT FRONT SUSPENSION (ONE) - R+R - CHECK WHEEL GEOMETRY SEPARATELY

Replace the track control arm

Op. 4410B40 LOWER TRACK CONTROL ARM (WITH BALLJOINT) FOR LEFT OR RIGHT FRONT SUSPENSION (ONE) - R+R - CHECK WHEEL GEOMETRY SEPARATELY

For 1.4 16V versions:

Locate the area of the possible noise source: top or bottom.

Starting from the area where the knocking was identified, check

See Test 4410OA CHECKS ON CORRECT TIGHTENINGS FOR FRONT SUSPENSION

the tightening torques of the fixing bolts for:

- shock absorber stem to mounting on turret;

- steering knuckle to shock absorber bracket;

- steering box to the crossmember;

- steering rod to the steering knuckle;

- the anti-roll bar to the crossmember;

- the connecting rod to the shock absorber;

- the connecting rod to the bar;

- the front bush to the track control arm;

- the rear bush to the track control arm;

- the track rod end to the steering knuckle;

- fastenings securing crossmember bracket to body side member;

- rear fastenings securing crossmember to bodyshell;

- fastening securing band to crossmember;

- fastening for front brake caliper;

- engine connecting rod fastenings to crossmember

For 1.9 JTD 8V and 16V versions:

Locate the area of the possible noise source: top or bottom.

Starting from the area where the knocking was identified, check

See Test 4410OA CHECKS ON CORRECT TIGHTENINGS FOR FRONT SUSPENSION

the tightening torques of the fixing bolts for:

- shock absorber stem to mounting on turret;

- steering knuckle to shock absorber bracket;

- steering box to the crossmember;

- steering rod to the steering knuckle;

- the anti-roll bar to the crossmember;

- the connecting rod to the shock absorber;

- the connecting rod to the bar;

- the front bush to the track control arm;

- the rear bush to the track control arm;

- the track rod end to the steering knuckle;

- fastenings securing crossmember bracket to body side member;

- rear fastenings securing crossmember to bodyshell;

- fastening securing band to crossmember;

- fastening for front brake caliper;

- engine connecting rod fastenings to crossmember.

The fault is due to another system (engine, clutch, gearbox, differential).

Search for the cause in one of these systems, following the appropriate diagnostic procedures.