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.
Oil sensor - location/task/design/function - GF18.40-P-4111A
ENGINES 111.951 /955 /956 /957 /981 /982
ENGINES 112.910 /911 /912 /913 /914 /916 /917 /920 /921 /922 /923 /940 /941 /942 /943 /944 /946 /947 /949 /953 /954 /955 /970 /972 /973 /975
ENGINES 113.940 /941 /942 /943 /948 /960 /961 /963 /965 /966 /967 /968 /969
ENGINES 166.940 /960 /990 /995
Shown on engines 112, 113 in models 129, 163, 170, 202, 208, 210, 215, 220
| Oil sensor position | Engines 111.951/ 951/955 | GF18.40-P-4111-01GS | |
| M112, 113 in models 129, 163, 170, 202, 208, 210, 215, 220 and models 203, 211 with 4MATIC | GF18.40-P-4111-01A | ||
| M112, 113 in models 203, 211 without 4MATIC and model 209 | GF18.40-P-4111-01AA | ||
| M166 | GF18.40-P-4111-01GC | ||
| Oil sensor task | Detecting oil level, oil temperature, oil quality | ||
| Oil sensor design | The oil sensor consists of:
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| Oil sensor function | GF18.40-P-4111-02A |
NO RELATED
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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.