P2085Exhaust Gas Temperature Sensor Circuit Intermittent (Bank 1 Sensor 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2085 marks the signal of exhaust temperature sensor 2 on bank 1 as erratic. GM monitors it with the same logic as sensor 1 but on separate counters. In the diesel table 18OBDG04 a step of more than 10 ohms between two 100 ms samples counts as a failure, and 20 failures within 40 samples set the code; on the 3.0 L LZO (25OBDG04B) a raw jump above 100 °C in 12 of 25 samples is enough. Both carry Type B, so the lamp needs a second faulty trip. Ford's 2014 petrol list shows P2085 without the lamp marker. Because sensor 2 often sits under the vehicle, splashed water and road salt in the connector are frequent triggers. Implausible but stable readings set P2084.
- What you may notice
- Engine warning lamp on after repeated occurrence
- Erratic sensor 2 value in live data
- Regeneration interrupted
- Likely causes
- LikelyWater or road salt in the underbody sensor connector
- PossibleLead rubbing on the exhaust or a bracket, intermittent break
- PossibleInternal fault in the sensor causing unstable resistance
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €0 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.