| Different types of glow plugs |
| There are different types of glow plugs fitted in the 4-cylinder 2.0 ltr. 4-valve TDI engine in Audi A4 vehicles: |
| Engine code letters BLB, BNA |
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| These engines are fitted exclusively with metal glow plugs. |
| Engine code letters BRD, BRE, BRF, BVA, BVF, BVG |
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| These engines are fitted exclusively with NGK ceramic glow plugs. |
Note | NGK ceramic glow plugs are colour-coded with a white, or possibly “silver-coloured” seal. |
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