OPEL / VAUXHALL Z12XEP — 1.2L Engine
1.2L · 80 hp
Engine overview
Vehicles with this engine
Factory specifications
Values from the manufacturer documentation for this engine.
Engine (general)
| Engine code | Z 12 XEP |
| Capacity | 1229 cc |
| Idle speed | 750 - 970 rpm |
| Normal | 14.0 - 16.0 bar |
| Differential limit between cylinders | < 1.0 bar |
| Max. compression loss between cylinders | < 25 % |
| Oil pressure | 1.5 / 750-970 bar/rpm |
| Idle speed | 670 - 830 rpm |
| Differential limit between cylinders | 1.0 bar |
| Max. compression loss between cylinders | 25 % |
| Oil pressure | 1.5 bar/rpm |
Engine (petrol)
| Fuel system (make and type) | Bosch Motronic ME 7.6.2 |
| Number of cylinders | 4 |
| Firing order | 1-3-4-2 |
| Spark plugs (make and type) | Bosch FQR 8 LEU2 |
| Spark plug gap | 0.85 - 0.95 mm |
| Fuel pump pressure | 3.0 bar |
| Fuel system (make and type) | Bosch Motronic ME 7.6.1 |
| Firing order | 1 - 3 - 4 -2 |
| Spark plugs (make and type) | Bosch FQR8LEU2 |
| Fuel pump pressure | 3.8 bar |
| CO exhaust gas | < 0.5 % |
| CO at fast-idle speed | < 0.2 % |
| Lambda | 0.97 - 1.03 |
Cooling system
| Thermostat opens at | 92 °C |
Brakes
| Disc thickness, front | 24.0 mm |
| Disc thickness, front, min. | 21.0 mm |
| Disc thickness, rear | 10.0 mm |
| Disc thickness, rear, min. | 8.0 mm |
| Drum diameter, rear | 230.0 mm |
| Drum diameter, rear, max. | 231.0 mm |
| Drum lining thickness, min. | 1.0 mm |
| Brake pad thickness, front | 12.0 mm |
| Brake pad thickness, front, min. | 2.0 mm |
| Brake pad thickness, rear | 10.5 mm |
| Brake pad thickness, rear, min. | 2.0 mm |
| Drum diameter, rear | 200.0 mm |
| Drum diameter, rear, max. | 201.0 mm |
Steering and wheel alignment
| Toe-in, front | 0° 00' ± 10' ° |
| Camber, front | -0° 35' ± 45' ° |
| Max. difference left side - right side | 1° ° |
| Castor, front | 4° 00' ± 45' ° |
| Toe-in, rear | 0° 14' +30'/-20' ° |
| Toe-in, rear | 0° 07' +30'/-20' ° |
| Max. difference left side - right side | 25' ° |
| Camber, rear | -1° 15' ± 30' ° |
| Max. difference left side - right side | 35' ° |
| Camber, front | -0° 30' ± 45' ° |
| Camber, front | -0° 25' ± 45' ° |
| Castor, front | 3° 55' ± 45' ° |
| Castor, front | 4° 05' ± 45' ° |
| Castor, front | 3° 50' ± 45' ° |
| Toe-in, rear | 0° 10' +30'/-20' ° |
| Toe-in, front | 0°10' ± 10' ° |
| Camber, front | -1° 10' ± 45' ° |
| Camber, front | -1° 20' ± 45' ° |
| Camber, front | -0° 50' ± 45' ° |
| Castor, front | 1° 35' ± 1° ° |
| Castor, front | 1° 30' ± 1° ° |
| Castor, front | 1° 55' ± 1° ° |
| Toe-in, rear | 0°10' +30'/-15' ° |
| Max. difference left side - right side | 15' ° |
| Camber, rear | -1° 30' ± 30' ° |
Wheels and tyres
| Tyre size | 195/65 R15 91T/H (6½Jx15) |
| Tyre size | 205/55 R16 91H (6½Jx16) |
| Tyre size | 225/45 R17 91H (7Jx17) |
| Front tyre pressure | 2.0 bar |
| Rear tyre pressure | 2.0 bar |
| Optional | 185/65 R15 88T/H (6½Jx15) |
| Optional | 195/60 R15 88T/H (6½Jx15) |
| Front tyre pressure | 2.3 bar |
| Rear tyre pressure | 2.1 bar |
| Spare tyre size | T115/70 R16 |
| Spare tyre pressure | 4.2 bar |
| Tyre size | 155/80 R13-79T |
Capacities
| Engine sump, incl. filter | 3.5 l |
| Manual transmission | F13 |
| Gearbox refill | 1.6 l |
| Cooling system | 5.6 l |
| Air-conditioner refrigerant | 475 g |
Torque settings
| Cylinder head bolts — Stage 1 | 25 Nm |
| Cylinder head bolts — Stage 2 | 60 ° |
| Cylinder head bolts — Stage 3 | 60 ° |
| Cylinder head bolts — Stage 4 | 60 ° |
| Spark plugs | 25 Nm |
| Oxygen sensor | 40 Nm |
| Wheel bolts | 110 Nm |
Engine codes in the same family
The same code prefix usually means the same block with a different output, fuel or model year. Procedures are often shared — check the code on the engine plate.
Workshop procedures for this engine
Step-by-step procedures from the workshop database.
- Corsa C Clutch F13 F17
- Corsa C F 13 F17 Gearbox
- Astra H F13+/F17+ Gearbox
- Astra H Clutch
- Wagon R (Z12XEP) clutch
- Corsa C/Tigra B Z12XEP, Z14XEP
- Astra H Z12XEP, Z14XEP
- Meriva Z14XEP; Corsa C Combo Z12XEP ancillary
- Corsa C 1.2, 1.4; Astra G Z12XEP; Corsa D 1.0, 1.2, 1.4; Astra J 1.4; Zafira Tourer 1.4; Insignia 1.4; Tigra B z14xep
Got a Z12XEP problem? Ask for free.
Describe the symptoms — TorqFix replies with a diagnosis cited from verified workshop data.
Get free diagnosis →Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
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The story behind TorqFix →Workshop data on this page last updated 22 Aug 2026.