Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2012 Lexus IS 250C Standard TransFACTORY OEM SERVICE PROCEDURE
Torque Specifications
| Part Tightened | N*m | kgf*cm | ft*lbf |
|---|---|---|---|
| Cylinder head cover sub-assembly x Camshaft timing oil control valve (OCV) | 10 | 102 | 7 |
| Throttle body assembly x Intake air surge tank assembly | 10 | 102 | 7 |
| ECM x Engine room ECM box | 5.5 | 56 | 49 in*lbf |
| Engine room ECM cover x Engine room ECM box | 5.5 | 56 | 49 in*lbf |
| Accelerator pedal rod assembly x Body | 5.4 | 55 | 48 in*lbf |
| Camshaft position sensor x Cylinder head cover sub-assembly | 10 | 102 | 7 |
| Crankshaft position sensor x Cylinder block sub-assembly | 10 | 102 | 7 |
| Spark plug x Cylinder head sub-assembly | 18 | 184 | 13 |
| Ignition coil x Cylinder head cover sub-assembly | 10 | 102 | 7 |
| Engine coolant temperature sensor x Cylinder head sub-assembly | 20 | 204 | 15 |
| Knock sensor x Cylinder block sub-assembly | 20 | 204 | 15 |
| Air fuel ratio sensor x Exhaust manifold (without SST) |
44 | 449 | 32 |
| Air fuel ratio sensor x Exhaust manifold (with SST) |
40 | 408 | 30 |
| Heated oxygen sensor x Exhaust manifold (without SST) |
44 | 449 | 32 |
| Heated oxygen sensor x Exhaust manifold (with SST) |
40 | 408 | 30 |
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.