The 1.2-liter Opel Z12XEP or LB4 engine was produced from 2004 to 2009 in Austria and was installed only on the third and fourth generations of the Corsa model and the very first Agila. After upgrading to Euro 5 environmental standards, this power unit received a new A12XER index.
The Z10 series also includes engines: Z10XE, Z10XEP, Z12XE, Z14XE and Z14XEP.
The Opel Z12XEP engine uses a lightweight cast iron cylinder block with a cast iron crankshaft and an aluminum overhead camshaft head with 2 chain drives (DOHC) and 4 valves per cylinder (16 valves in total). This is an updated version of the Z12XE engine equipped with Twinport technology. The crankshaft and oil galleries have also been redesigned. The engine uses ECU Bosch ME7.6.1 / Bosch ME7.6.2.
The engine was installed on:
- Opel Agila A (H00) in 2004 – 2007;
- Opel Corsa C (X01) in 2004 – 2006;
- Opel Corsa D (S07) in 2006 – 2009.
Specifications
| Production years | 2004-2009 |
| Displacement, cc | 1229 |
| Fuel system | distributed injection |
| Power output, hp | 80 |
| Torque output, Nm | 110 |
| Cylinder block | cast iron R4 |
| Block head | aluminum 16v |
| Cylinder bore, mm | 73.4 |
| Piston stroke, mm | 72.6 |
| Compression ratio | 10.5 |
| Features | Twinport |
| Hydraulic lifters | yes |
| Timing drive | chain |
| Phase regulator | no |
| Turbocharging | no |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 3.5 |
| Fuel type | petrol |
| Euro standards | EURO 4 |
| Fuel consumption, L/100 km (for Opel Corsa 2007) — city — highway — combined |
8.0 5.0 6.1 |
| Engine lifespan, km | ~250 000 |
| Weight, kg | 100 |
Explanation of Z12XEP marking
- Z – Euro 4 engine;
- 12 – 1.2 liters;
- X – Compression ratio from 10 to 11.5: 1;
- E – multi-point fuel injection system;
- P – increased power.
Disadvantages of the Z12XEP engine
- most of the calls to the service are due to electrical failures or an ECU block;
- in second place are the problems with the Twinport dampers and the EGR valve;
- chain resource rarely exceeds 100,000 km, then it stretches and begins to rattle;
- also periodically the owners have to replace the thermostat and the oil pump;
- when looking for the source of an oil leak, start with the oil pressure sensor, the weak point is there.
