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P0197
System
Powertrain (Fuel/Air)
Scanner required
Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test)

Engine Oil Temperature Sensor Circuit Low Input

Understand P0197, common causes, and the right TOPDON scanner to diagnose it.

Oil temp sensor circuit low.

Common symptoms

  • Check engine light
  • Possible false overheat protection

Typical causes

  • Short to ground
  • Failed sensor

What scanner do you need?

Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test)

Use live data and freeze frame to confirm the fault before replacing parts. ABS, SRS, and network U-codes usually require a full-system scanner.

Diagnostic tips

  • Record freeze frame data when the code first sets
  • Clear the code only after fixing the root cause
  • Check for related pending codes that point to a common issue
  • Verify battery voltage is above 12.4V before chasing sensor codes

Recommended TOPDON scanners

Frequently asked questions

What does P0197 mean?
P0197 indicates engine oil temperature sensor circuit low input. Oil temp sensor circuit low.
Can I diagnose P0197 with a basic code reader?
P0197 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Which TOPDON scanner do I need for P0197?
Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test) See recommended tools on this page.
Is it safe to drive with P0197?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.