16502 on 1996-2001 Audi A4 — Engine Coolant Temperature Sensor (G62): Signal too High
1 vehicles · 1 makes · $30-$180 repair
Most Reported On
16502 is an OBD-II diagnostic trouble code meaning “Engine Coolant Temperature Sensor (G62): Signal too High.” VAG/VCDS fault code 16502 corresponds to OBD-II code P0118 (Ross-Tech address 000280). It indicates the engine control module detected an abnormally high voltage signal from the Engine Coolant Temperature (ECT) sensor G62. High voltage is read as an implausibly cold engine (often colder than ambient), typically caused by an open circuit or failed sensor, and can disrupt cold-start fueling, idle, and the cooling-fan/warm-up strategy. 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 16502, 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 16502 mean?
16502 stands for "Engine Coolant Temperature Sensor (G62): Signal too High." VAG/VCDS fault code 16502 corresponds to OBD-II code P0118 (Ross-Tech address 000280). It indicates the engine control module detected an abnormally high voltage signal from the Engine Coolant Temperature (ECT) sensor G62. High voltage is read as an implausibly cold engine (often colder than ambient), typically caused by an open circuit or failed sensor, and can disrupt cold-start fueling, idle, and the cooling-fan/warm-up strategy.
What are the most common causes of 16502?
The most common causes of 16502 are: Faulty engine coolant temperature sensor (G62) reading out of range, Open or broken wiring in the ECT sensor signal circuit, Corroded, loose, or damaged sensor connector / poor ground, Loss of ground reference to the sensor, Low coolant level or air in the cooling system affecting the sensor, Failed or faulty engine control module (rare). The specific cause varies by vehicle.
How much does it cost to fix 16502?
Repair costs for 16502 range from $30 to $180, depending on the vehicle and root cause.
Which vehicles are affected by 16502?
Au7o has documented 16502 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.