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2001 Audi O2 Sensor Voltage Issue: All Four Sensors Show No Signal

Model: 2001 Audi Fault Code: P2177 Posted: 2015-09-29 15:52

I own a 2001 Audi and am experiencing a problem where all four oxygen (O2) sensors are showing no voltage reading. I've already checked the fuses, which are fine, and there's no visible damage to the exhaust wiring. The issue has been difficult to diagnose, and I'm looking for help identifying the root cause. No burned wires have been found on the exhaust system. Can anyone provide insight or suggestions based on common O2 sensor issues in this model?

Related fault codes
P2177
Comments (1)
Anonymous 2015-09-29 16:01

For a 2001 Audi, could you specify which engine variant (e.g., 2.4L, 3.0L)? Are you currently seeing any specific diagnostic trouble codes (DTCs) related to the O2 sensors? Have there been any prior repairs or modifications done on this vehicle? Do you have access to an OBD-II scanner to read live data and stored codes?