merci ChatGPT:

or a Honda CR-V, OBD-II code P1685 means:

🔧 P1685 – Metering Oil Pump Control Circuit Malfunction

(also described as VTC Oil Control / Variable Valve Timing oil pressure control issue)

What it relates to

The engine oil metering system that controls Variable Valve Timing (VTEC/VTC)

Commonly involves the oil control solenoid (VTC solenoid), wiring, or oil pressure

Common symptoms

Check Engine Light on

Reduced engine performance

Rough idle or hesitation

Poor fuel economy

Engine may go into limp mode

Most common causes

Low or dirty engine oil (very common on Hondas)

Incorrect oil viscosity

Faulty VTC / oil control solenoid

Clogged oil passages or screen

Wiring or connector issues to the solenoid

ECM issue (rare)

What to check first (in order)

✅ Check engine oil level

✅ Confirm correct oil type (Honda is sensitive to viscosity)

🔁 Change oil and filter if overdue or oil is dirty

🔌 Inspect wiring and connector at the VTC oil control solenoid

🧪 Test or replace the oil control solenoid

🛠️ Check oil pressure if the problem persists

Typical fix

Oil change resolves this code surprisingly often

If not, replacing the VTC oil control solenoid usually fixes it

Is it safe to drive?

⚠️ Short trips only. Long-term driving can:

Damage the timing system

Cause engine wear due to improper oil control

If you want, tell me:

Model year & engine size (2.0L, 2.4L, 1.5T, etc.)

Whether the oil was recently changed

I can give exact solenoid location, resistance specs, and step-by-step testing for your specific CR-V.