CorollaFix
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Warning lights

What each light in the meter means, how serious it is, and what to do. Most lights come on for a few seconds when you turn the key to ON — that is a bulb check and is normal.

Stop safely nowGet it checked soonInformation only

Brake system warning

Red Stop safely now
What it meansParking brake on or brake fluid level low
Fitted onE120 all markets unless noted; equipment-dependent
What to doStop and check brake fluid; if it lights together with ABS, stop immediately. Brakes may be faulty.

Low oil pressure warning

Red Stop safely now
What it meansEngine oil pressure too low
Fitted onE120 all markets unless noted; equipment-dependent
What to doStop and switch off the engine at once. Do not drive even a few metres. It may flicker at idle or after hard braking (normal). It is not an oil-level gauge.

Seat belt reminder (driver / front passenger)

Red Get it checked soon
What it meansSeat belt not fastened
Fitted onE120 all markets unless noted; equipment-dependent
What to doFasten the belt. Buzzer sounds for 30 s above 15 km/h, then another 90 s with a different tone.

Malfunction indicator lamp (Check Engine)

Amber Get it checked soon
What it meansEngine, ECT (automatic) electrical, or electronic throttle fault (petrol). On the 3ZZ-FE, the engine may not rev (fail-safe).
Fitted onE120 all markets unless noted; equipment-dependent
What to doHave the car checked as soon as possible and read the DTCs (see the DTC tab).

Symbols are our own drawings and may look slightly different from your meter. Not every car has every light; it depends on grade and options.

Scanner guide

Scanner guide: Corolla E120

You can read the check-engine code on the Corolla E120 without any scanner, using the blink code. A scanner is optional.

Blink code: a paper clip in the DLC socket
Works

With the engine off, bridge terminals 4 (CG) and 13 (TC) with a short wire, turn the key ON (engine off) and count the check-engine light flashes. Match the number to the code list.

Cheap ELM327 + Torque or Car Scanner app
May work

Works only if the car speaks standard OBD-II; older Japanese imports may not connect. If it fails, use the blink code.

Workshop multi-brand scanner
Works best

The easy way if you do not want to do it yourself.

Where is the socket: 16-pin socket (DLC3) under the dash on the driver side.

What it can read:

  • Engine (check-engine light) fault codes: blink code or scanner.

Good to know:

  • See Fault codes on this guide for the full blink-code steps and the code list.
  • No scanner needed for the oil, battery or handbrake light: they come from a simple switch or sensor. Check the oil level, drive belt / battery terminals and brake fluid first.

Source: UstadFix owner notes