16500 on 1996-2001 Audi A4 — Engine Coolant Temp. Sensor (G62): Implausible Signal
1 vehicles · 1 makes · $30-$180 repair
Most Reported On
16500 is an OBD-II diagnostic trouble code meaning “Engine Coolant Temp. Sensor (G62): Implausible Signal.” This VAG (VW/Audi/SEAT/Skoda) fault code, equivalent to OBD-II P0116, indicates the engine control module has received an implausible or out-of-range signal from the engine coolant temperature sensor (G62). It means the coolant temperature reading does not correlate logically with expected values (for example, the sensor reports a sudden, unrealistic temperature drop or fails to track engine warm-up). This can cause incorrect fueling, high or fluctuating idle (often 1200-3000 rpm on a warm start), and erratic temperature gauge behavior. This code is most commonly reported on 1996-2001 Audi A4, with repair costs ranging from $30 to $180.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose 16500, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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FAQ
What does 16500 mean?
16500 stands for "Engine Coolant Temp. Sensor (G62): Implausible Signal." This VAG (VW/Audi/SEAT/Skoda) fault code, equivalent to OBD-II P0116, indicates the engine control module has received an implausible or out-of-range signal from the engine coolant temperature sensor (G62). It means the coolant temperature reading does not correlate logically with expected values (for example, the sensor reports a sudden, unrealistic temperature drop or fails to track engine warm-up). This can cause incorrect fueling, high or fluctuating idle (often 1200-3000 rpm on a warm start), and erratic temperature gauge behavior.
What are the most common causes of 16500?
The most common causes of 16500 are: Faulty/aging engine coolant temperature sensor (G62) — the older black sensors on 1995-2002 VAG cars are a known weak point, superseded by green units, Corroded, loose, or damaged connector at the G62 sensor, Wiring faults (open, short, or chafing) in the coolant temperature sensor circuit, Poor ground or reference voltage to the sensor, Low coolant level or air pockets causing the sensor to read inconsistent temperatures, Faulty engine control module (rare). The specific cause varies by vehicle.
How much does it cost to fix 16500?
Repair costs for 16500 range from $30 to $180, depending on the vehicle and root cause.
Which vehicles are affected by 16500?
Au7o has documented 16500 across 1 vehicle models from 1 manufacturers: Audi.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.