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MOT History from tests of petrol PORSCHE 911s year 1978

Review the list of common PORSCHE 911 failures below or to perform a specific mot history check on your PORSCHE then use our popular KnowYourCar service

mot history
Pass percent:76.18%
(The average a petrol PORSCHE 911 year 1978 passes without issue)
Based on:2,292 MOT Tests
Most common failuresNo# failures
Headlamp aim out of alignment161
Registration plate lamp issues64
Rear brake binding56
Parking brake: efficiency below requirements |3.7.B.7|51
Exhaust emissions carbon monoxide content excessive |7.3.B.1a|46
Registration plate issues45
Windscreen wiper does not clear the windscreen effectively43
Rear parking brake recording little or no effort43
Horn not working |1.6.2a|37
Brake hose excessively deteriorated30
Service brake: efficiency below requirements |3.7.B.7|27
Brakes imbalanced across an axle26
Brake pipe excessively corroded23
Offside Front position lamp|s| not working |1.1.A.3b|22
Nearside Stop lamp not working |1.2.1b|20
Offside Stop lamp not working |1.2.1b|19
Nearside front brake binding |3.7.B.1|19
Exhaust emissions hydrocarbon content excessive |7.3.B.1b|18
Offside Headlamp not working on dipped beam |1.7.5a|17
Offside front brake binding |3.7.B.1|16
Exhaust has a major leak of exhaust gases |7.1.2|14
Nearside Front position lamp|s| not working |1.1.A.3b|13
Nearside Headlamp not working on main beam |1.7.5a|12
Nearside Rear position lamp|s| not working |1.1.A.3b|11
Front brake application uneven11
Nearside Front Suspension component mounting prescribed area is excessively corroded |2.4.A.3|11
Steering column top bearing excessively worn |2.1.2c|11
Nearside Headlamp not working on dipped beam |1.7.5a|11
Offside Headlamp not working on main beam |1.7.5a|11
Parking brake lever has no reserve travel |3.1.6b|9
Offside Seat belt anchorage prescribed area is excessively corroded |5.2.6|9
Offside Front front brake binding |3.7.B.1|8
Nearside Front Direction indicator not working |1.4.A.2c|8
Offside Headlamp aim beam image obviously incorrect |1.8.A.1b|7
Nearside Rear wheel bearing has excessive play |2.6.2|7
Nearside Rear Suspension component mounting prescribed area is excessively corroded |2.4.A.3|7
Battery insecure |1.9.1|7
Nearside Rear Stop lamp not working |1.2.1b|6
Nearside Front front brake binding |3.7.B.1|6
Nearside Side repeater not working |1.4.A.2c|6
Offside Front Suspension component mounting prescribed area is excessively corroded |2.4.A.3|6
Offside Front Seat belt anchorage prescribed area is excessively corroded |5.2.6|6
Nearside Front Front position lamp|s| not working |1.1.A.3b|6
Nearside Seat belt anchorage prescribed area is excessively corroded |5.2.6|6
Headlamp switch faulty |1.7.1|5
Offside Front wheel bearing has excessive play |2.5.A.3c|5
Nearside Headlamp aim beam image obviously incorrect |1.8.A.1b|5
Nearside Rear Direction indicator not working |1.4.A.2c|5
Offside Rear front brake binding |3.7.B.1|5
Windscreen washer not working 5
Offside Front Front position lamp|s| not working |1.1.A.3b|5
Nearside Front Anti-roll bar has excessive play in a pin/bush |2.4.G.2|5
Offside Front Anti-roll bar has excessive play in a pin/bush |2.4.G.2|5
Front Headlamp not working on main beam |1.7.5a|5
Mechanical brake component has restricted free movement5
Rear Exhaust has a major leak of exhaust gases |7.1.2|5
Offside rear brake recording little or no effort |3.7.B.5a|5
Offside Rear Rear position lamp|s| excessively deteriorated so that it is not visible from a reasonable distance |1.1.A.3d|5
Nearside Front position lamp|s| incorrect colour |1.1.A.3e|5
Rear fog lamp not working |1.3.2b|4
Horn control missing |1.6.1|4
Offside Rear Stop lamp not working |1.2.1b|4
Offside Front Direction indicator not working |1.4.A.2c|4
Brake hose has insufficient room to move4
Emissions not tested |7.0|4
Nearside Front Track rod end ball joint has excessive play |2.2.B.1f|4
Driver`s seat cannot be secured in the upright position. |6.2.A.2|4
Offside Rear position lamp|s| excessively deteriorated so that it is not visible from a reasonable distance |1.1.A.3d|4
Direction indicators flashing more than 120 times a minute |1.4.A.2g|4
Offside Side repeater not working |1.4.A.2c|4
Nearside Front Seat belt anchorage prescribed area is excessively corroded |5.2.6|4
Nearside Front wheel bearing has excessive play |2.5.A.3c|4
Exhaust emissions hydrocarbon content excessive (8.2.1.2 (b))4
Nearside Rear Vehicle structure has excessive corrosion, seriously affecting its strength within 30cm of the body mountings |6.1.B.2|4
Offside Rear Vehicle structure has excessive corrosion, seriously affecting its strength within 30cm of the body mountings |6.1.B.2|4
Offside Front Lower Seat belt anchorage prescribed area is excessively corroded |5.2.6|4
Offside Rear Wheel nut|s| missing |4.2.A.1e|4
Offside Steering rack gaiter split |2.2.D.2d|4
Offside Front position lamp|s| incorrect colour |1.1.A.3e|4
Nearside Rear position lamp|s| excessively deteriorated so that it is not visible from a reasonable distance |1.1.A.3d|4
Offside Rear position lamp|s| not working |1.1.A.3b|4
Offside Rear fog lamp not working |1.3.2b|3
Steering column movement between the shaft and steering wheel |2.1.2b|3
Parking brake efficiency below requirements |1.4.2 |a| |i||3
Hazard warning tell tale not working correctly |1.4.B.1e|3
Offside Rear rear brake recording little or no effort |3.7.B.5a|3
Offside Stop lamp adversely affected by the operation of another lamp |1.2.1f|3
Hazard warning switch faulty |1.4.B.1d|3
Nearside Front Position lamp not working |4.2.1 |a||3
Offside Headlamp aim beam image kick up to the offside |1.8|3
Exhaust emissions carbon monoxide content excessive (8.2.1.2 (b))3
Windscreen has damage3
Offside Rear Front position lamp|s| not working |1.1.A.3b|3
Offside Front Headlamp not working on dipped beam |1.7.5a|3
Nearside Headlamp not in good working order adversely affecting beam image |1.2.4a|3
Offside Front Vehicle structure has excessive corrosion, seriously affecting its strength within 30cm of the body mountings |6.1.B.2|3
Front brake disc in such a condition that it is seriously weakened3
Offside Rear Position lamp not working (4.2.1 (a) (ii))3
Fuel cap/sealing device missing (6.1.3 (b) (i))3
Nearside Rear Rear position lamp|s| excessively deteriorated so that it is not visible from a reasonable distance |1.1.A.3d|3
Offside Rear wheel bearing has excessive play |2.6.2|3
Rear Mechanical brake component has restricted free movement3
Nearside Front Front wheel bearing rough when rotated |2.5.A.2|3
Offside Front Shock absorber has a serious fluid leak |2.7.3|3
Direction indicators not working |1.4.A.2c|3
Nearside Rear Wheel nut|s| missing |4.2.A.1e|3
Nearside Front Direction indicators not working |1.4.A.2c|3
Offside Rear Direction indicators not working |1.4.A.2c|3
Brake performance not tested |3.7.A.1|3
Nearside Steering rack gaiter split |2.2.D.2d|3
Nearside Rear Shock absorber has a serious fluid leak |2.7.3|3
Horn not loud enough to be heard by another road user |1.6.2b|3
Offside Front Wheel nut|s| missing |4.2.A.1e|3
Offside Front Headlamp not working on main beam |1.7.5a|3
Steering rack gaiter insecure |2.2.D.2d|2
Offside Front Steering rack gaiter split |2.2.D.2d|2
Nearside Rear Inner Drive shaft joint constant velocity boot split or insecure, no longer prevents the ingress of dirt |6.1.7 |g| |ii||2
Offside Rear Inner Drive shaft joint constant velocity boot split or insecure, no longer prevents the ingress of dirt |6.1.7 |g| |ii||2
Offside Rear Shock absorber has a serious fluid leak |2.7.3|2
Offside Front Suspension arm has excessive play in a ball joint |2.4.G.2|2
Front passenger door cannot be opened from inside the vehicle |6.2.B.1b|2
Offside Front Braking system leaking |3.6.A.1|2
Nearside Track rod end ball joint dust cover excessively damaged so that it no longer prevents the ingress of dirt |2.2.C.1c|2
Offside Track rod end ball joint dust cover excessively damaged so that it no longer prevents the ingress of dirt |2.2.C.1c|2
Windscreen has a sticker or other obstruction encroaching into the swept area by more than 40mm outside zone `A` |8.3.1e|2
Fuel cap/sealing device sealing washer deteriorated |7.2.4c|2
Nearside Headlamp aim beam image kick up to the offside |1.8|2
Horn not working (7.7 (a) (ii))2
Nearside Rear Service brake excessively binding (1.2.1 (f))2
Parking brake efficiency below requirements (1.4.2 (a) (i))2
Hazard warning lamps not flashing in phase, with ignition on |1.4.B.1f|2
Seat belt anchorage prescribed area is excessively corroded |5.2.6|2
Horn not working (7.7 (a))2
Side repeater not working |1.4.A.2c|2
Headlamp not working on main beam |1.7.5a|2
Nearside Front An item not tested |Manual|2
Front Passenger`s seat cannot be secured in the upright position. |6.2.A.2|2
Offside Rear Suspension component mounting prescribed area is excessively corroded |2.4.A.3|2
Nearside Front Driver`s seat cannot be secured in the upright position. |6.2.A.2|2
Nearside Rear Seat belt insecurely fixed to the vehicles structure |5.2.1a|2
Nearside Front Vehicle structure has excessive corrosion, seriously affecting its strength within 30cm of the body mountings |6.1.B.2|2
Front Headlamp not working on dipped beam |1.7.5a|2
Offside Front Position lamp not working (4.2.1 (a) (ii))2
Offside Rear Rear position lamp|s| not working |1.1.A.3b|2
Nearside Front Track rod end ball joint dust cover excessively deteriorated so that it no longer prevents the ingress of dirt |2.2.C.1c|2
Fuel pipe leaking |7.2.3|2
Rear fog lamp tell tale not working |1.3.1b|2
Nearside Front passenger door cannot be opened from inside the vehicle |6.2.B.1b|2
Front passenger door cannot be opened from outside the vehicle |6.2.B.1b|2
Nearside rear brake recording little or no effort |3.7.B.5a|2
Nearside Front Shock absorber has negligible damping effect |2.7.5|2
Nearside Front Anti-roll bar attachment bracket/mounting insecure |2.4.G.1|2
Offside Front Anti-roll bar attachment bracket/mounting insecure |2.4.G.1|2
Nearside Rear position lamp|s| adversely affected by the operation of another lamp |1.1.A.3f|2
Offside Rear Suspension component attachment bracket/mounting corroded and seriously weakened |5.3.3 |b| |i||2
Nearside Outer Front Anti-roll bar has excessive play in a pin/bush |2.4.G.2|2
Offside Outer Front Anti-roll bar has excessive play in a pin/bush |2.4.G.2|2
Nearside Headlamp insecure |1.7.3|2
Offside Front Front wheel bearing rough when rotated |2.5.A.2|2
Nearside Front Side repeater not working |1.4.A.2c|2
Offside Rear Body or chassis has excessive corrosion, seriously affecting its strength within 30cm of the body mountings |6.1.B.2|2
Exhaust emits excessive dense blue smoke during acceleration |7.3.A.2c|2
Offside Front Anti-roll bar rubber bush deteriorated resulting in excessive movement |2.4.G.2|2
Offside Rear Rear wheel bearing has excessive play |2.6.2|2
Indicator tell tale inoperative |1.4.A.2a|2
Nearside Front Anti-roll bar linkage rubber mounting deteriorated resulting in excessive movement |2.4.G.2|2
Offside Front Direction indicators not working |1.4.A.2c|2
Nearside Rear Direction indicators not working |1.4.A.2c|2
Driver`s door cannot be opened from inside the vehicle |6.2.B.1b|2
Nearside Rear Suspension arm corroded and seriously weakened |2.4.G.1|2
Dipswitch operation does not extinguish all main beam headlamps leaving at least one pair of dipped beam headlamps |1.7.4b|2
Offside Front Shock absorber has negligible damping effect |2.7.5|2
Nearside Track rod end ball joint has excessive play |2.2.B.1f|2
Horn not a continuous or uniform sound |1.6.2e|2
Offside Outer Lower Seat belt anchorage prescribed area is excessively corroded |5.2.6|2
Nearside Front Headlamp not in good working order adversely affecting beam image |1.2.4a|2
Offside Front Headlamp not in good working order adversely affecting beam image |1.2.4a|2
Offside Outer Front Anti-roll bar rubber bush deteriorated resulting in excessive movement |2.4.G.2|2
Service brake efficiency below requirements (1.2.2 (a) (i))2
Offside Obligatory mirror missing |8.1.1|2
Nearside Rear An item not tested |Manual|2
Front Fuel pipe leaking |7.2.3|2
Nearside Rear Rear position lamp|s| not working |1.1.A.3b|2
Brake pedal creeps down while the pedal is held under pressure |3.3.B.1a|2
Nearside Front Wheel nut|s| missing |4.2.A.1e|2
Nearside Front Headlamp not working on main beam |1.7.5a|2
All position lamps not working |1.1.A.3b|2
Position lamp switch faulty |1.1.A.1|2
Nearside Rear Body or chassis has excessive corrosion, seriously affecting its strength within 30cm of the body mountings |6.1.B.2|2
Fuel cap/sealing device does not fasten securely maintaining the sealing arrangement |7.2.4b|2
Nearside front brake recording little or no effort |3.7.B.5a|2
Offside front brake recording little or no effort |3.7.B.5a|2
Nearside Rear Position lamp not working |4.2.1 |a||2
Nearside Track rod end ball joint dust cover excessively deteriorated so that it no longer prevents the ingress of dirt |2.2.C.1c|2
Offside Track rod end ball joint dust cover excessively deteriorated so that it no longer prevents the ingress of dirt |2.2.C.1c|2
Rear Electrical wiring inadequately supported |1.9.2a|2
Nearside Rear Direction indicator incorrect colour |1.4.A.2f|2
Offside Rear Direction indicator incorrect colour |1.4.A.2f|2

We get to these numbers by trawling through over 1 billion MOT test results since 2004 and crunched the numbers. We remove anything to do with Tyres, as they are model independent and group together common non-model specific issues. We are trying to get to a picture of what models have what issues.

Please note: We take the data from the DVSA. This data is raw and can contain typos and spelling mistakes that garages may have entered while recording a MOT result. Specifically miss-match on names of models and makes. We are constantly cleaning the data so bear with the odd issue.

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