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Reference guide

Warning lights explained

Every light here is labeled in plain text, because a symbol without a name helps nobody standing in a parking lot. A light points at a system — it does not name the failed part.

This tool provides general educational guidance and does not replace an in-person inspection or professional diagnosis. Vehicle conditions can change quickly. If the vehicle feels unsafe, is overheating, has low oil pressure, has reduced braking ability, is leaking fuel, or is producing smoke, stop driving when safely possible.

Showing 13 of 13 lights.

Check Engine Light

The engine or emissions control system has stored a fault code. It covers hundreds of possible conditions, from a loose fuel cap to a failing sensor to a lean-running engine.

Can you still drive it?

Often yes for short distances if the vehicle drives normally — but the fault should be tested rather than assumed.

Can we inspect or diagnose it?

Yes — mobile diagnostics, at your home, workplace or business.

More urgent when

  • The light begins to flash
  • The engine loses power, stumbles or idles rough
  • Fuel economy drops noticeably
  • The temperature gauge is also climbing

Possible causes

  • Evaporative-emissions leak
  • Oxygen or air-fuel sensor
  • Ignition misfire
  • Vacuum leak
  • Mass airflow or intake sensor

What you can check

  • Fuel cap tight and sealing
  • Any change in how the vehicle drives
  • Whether other lights came on at the same time

What not to do

  • Do not buy parts based on a free code read
  • Do not clear the code before it is diagnosed — that erases the evidence

Recommended next step: Request mobile diagnostics.

Mobile diagnostics

Flashing Check Engine Light

A flashing Check Engine Light usually means an active misfire severe enough to risk damaging the catalytic converter.

Can you still drive it?

Treat it as stop-driving-when-safe. Limited, gentle movement to get off a road is reasonable; continuing a trip is not.

Can we inspect or diagnose it?

Yes — misfire diagnosis, coils, plugs and ignition components are core mobile work.

More urgent when

  • The engine is shaking or losing power
  • There is a raw fuel or hot exhaust smell
  • The temperature gauge is rising

Possible causes

  • Ignition coil
  • Spark plug
  • Fuel injector
  • Compression or valve-related fault
  • Wiring or connector failure

What you can check

  • Whether the shaking changes with engine speed
  • Whether the light steadies when you slow down

What not to do

  • Do not accelerate hard or climb long hills
  • Do not keep driving if the engine is shaking, overheating or smells unusual

Recommended next step: Get off the road safely and request diagnostics the same day if possible.

Mobile diagnostics

Oil-pressure light

The engine may not be receiving adequate oil pressure. This is a lubrication warning, not a reminder that an oil change is due.

Can you still drive it?

No. Shut the engine off as soon as you can stop safely.

Can we inspect or diagnose it?

We can check the level, pressure and sensor on site. Internal engine repair is not something we perform, and we will tell you straight if that is where it is heading.

More urgent when

  • The light is on steadily rather than flickering
  • There is ticking, knocking or rattling
  • The oil level is low or empty on the dipstick

Possible causes

  • Low oil level
  • Oil pump or pickup problem
  • Pressure sensor or wiring fault
  • Internal engine wear

What you can check

  • Oil level on the dipstick
  • Fresh oil under the vehicle

What not to do

  • Do not keep driving
  • Do not rev the engine to see if the light clears

Recommended next step: Stop the engine, check the level, and call or text before restarting.

Mobile oil service

Battery light

This usually means the charging system is not maintaining proper voltage. The battery itself may not be the cause.

Can you still drive it?

Short distances only. The vehicle is running on stored power and will stop when it runs out.

Can we inspect or diagnose it?

Yes — battery, alternator, belt and cable work are all mobile services.

More urgent when

  • Headlights and dash lights are dimming
  • The belt is squealing
  • The temperature gauge is also rising — that can mean a broken belt

Possible causes

  • Alternator
  • Belt
  • Wiring
  • Battery connection
  • Charging-system fault

What you can check

  • Belt present and intact
  • Battery terminals clean and tight

What not to do

  • Do not shut the engine off far from where you want to end up
  • Do not replace the battery before the charging system is tested

Recommended next step: Turn off unnecessary electrical loads, get somewhere safe, and request a charging-system test.

Electrical repairs

Brake warning light

Depending on the vehicle, this indicates an engaged parking brake, a low brake-fluid level, or a hydraulic pressure imbalance.

Can you still drive it?

Only if the cause is a parking brake left engaged. Otherwise treat it as stop-driving-when-safe.

Can we inspect or diagnose it?

Yes — brake inspection and mobile brake service. We do not repair hard brake lines.

More urgent when

  • The pedal feels soft, low or sinking
  • The ABS light is on at the same time
  • There is visible fluid at a wheel

Possible causes

  • Parking brake engaged
  • Low brake fluid from worn pads
  • Hydraulic leak
  • Master cylinder fault
  • Pressure-differential switch

What you can check

  • Parking brake fully released
  • Brake fluid level in the reservoir

What not to do

  • Do not keep topping off fluid and driving
  • Do not assume it is a sensor

Recommended next step: Release the parking brake. If the light stays on, stop driving when safely possible and request a brake inspection.

Mobile brake service

ABS light

The anti-lock braking system has detected a fault and disabled itself. Base brakes usually still function normally.

Can you still drive it?

Usually yes with extra caution — but you have lost anti-lock function and often traction and stability control with it.

Can we inspect or diagnose it?

Yes — ABS diagnostics and bolt-on hub assemblies with integrated sensors.

More urgent when

  • The red brake light is on at the same time
  • Weather is wet, icy or snowy
  • Wheels lock up in hard stops

Possible causes

  • Wheel-speed sensor
  • Damaged tone ring
  • Wiring or connector
  • Hub assembly with an integrated sensor
  • ABS module fault

What you can check

  • Whether the light appears only after a certain speed
  • Obvious wheel-sensor wiring damage

What not to do

  • Do not drive it hard in bad weather
  • Do not assume it is only a sensor without testing

Recommended next step: Request diagnostics to identify which wheel circuit is reporting the fault.

Mobile diagnostics

Traction-control light

Flashing usually means the system is actively working. Staying on solid usually means it has been turned off or has a fault.

Can you still drive it?

Usually yes, with extra caution in poor weather.

Can we inspect or diagnose it?

Yes — we can scan and test the related circuits.

More urgent when

  • The ABS or brake light is on too
  • The vehicle behaves oddly during acceleration
  • Weather is bad

Possible causes

  • Wheel-speed sensor
  • Steering-angle or yaw sensor
  • Mismatched or badly worn tires
  • Related ABS fault

What you can check

  • Whether the traction-control off button was pressed
  • Tire condition and pressures

What not to do

  • Do not rely on traction control in snow while the light is on

Recommended next step: Confirm the system was not switched off, then request diagnostics.

Mobile diagnostics

Temperature warning

The engine coolant temperature is above the safe operating range, or the sensor is reporting that it is.

Can you still drive it?

No. Stop driving when safely possible and let it cool.

Can we inspect or diagnose it?

Yes — radiators, thermostats, hoses and water pumps are core mobile work.

More urgent when

  • Steam from under the hood
  • The heater blows cold while the gauge is high
  • Power loss or knocking

Possible causes

  • Low coolant from a leak
  • Thermostat
  • Water pump
  • Cooling fan or fan control
  • Radiator restriction

What you can check

  • Coolant level once fully cool
  • Puddles under the vehicle
  • Whether the cooling fan runs

What not to do

  • Do not open a hot pressurized cooling system
  • Do not add cold water to a hot engine
  • Do not keep driving to reach a destination

Recommended next step: Shut it off, let it cool completely, and request a cooling-system inspection.

Cooling system repairs

Airbag light

The supplemental restraint system has a stored fault. In most cases the affected airbag will not deploy while the light is on.

Can you still drive it?

Mechanically yes, but a safety system is offline until it is repaired.

Can we inspect or diagnose it?

We can scan the system and report the stored fault. Airbag component repair is referred out — that is specialty work.

More urgent when

  • The vehicle was recently in a collision
  • Seats or seat wiring were recently removed or moved
  • The seat-belt light is also on

Possible causes

  • Seat-position or occupancy sensor
  • Clock spring in the steering column
  • Connector under a seat
  • Module fault after a collision

What you can check

  • Whether it started after work was done under a seat
  • Seat-belt buckle function

What not to do

  • Do not probe airbag connectors or wiring yourself

Recommended next step: Request a scan so you know what is stored, then plan the repair with a qualified shop.

Mobile diagnostics

TPMS light

The tire-pressure monitoring system is reporting low pressure on at least one tire, or a fault in the system itself.

Can you still drive it?

Usually yes at reduced speed after checking pressures, unless a tire is visibly low or damaged.

Can we inspect or diagnose it?

We can read the sensor data and tell you what the system reports. Tire repair, mounting and replacement go to Redneck Roadside or a tire shop — we do not perform tire service.

More urgent when

  • A tire is visibly low or the vehicle pulls
  • The light flashes then stays on — that usually indicates a system fault
  • You feel a vibration or thumping

Possible causes

  • Cold weather dropping pressure
  • A slow leak or puncture
  • A failed TPMS sensor battery
  • A sensor not relearned after tire work

What you can check

  • Actual pressures with a gauge
  • The door-jamb sticker for correct pressure
  • Nails or damage in the tread

What not to do

  • Do not drive on a visibly flat tire
  • Do not just reset the light without checking pressures

Recommended next step: Check and correct the pressures first. If the light stays on, request a scan.

Power-steering warning

The power-steering system — hydraulic or electric — has reduced or lost assist. Steering still works, but it takes much more effort.

Can you still drive it?

Short distances at low speed. Heavy steering at parking speeds is a real hazard in tight situations.

Can we inspect or diagnose it?

Select power-steering repairs, depending on the vehicle. We will tell you before scheduling whether yours is one we can do mobile.

More urgent when

  • Assist cuts in and out while turning
  • There is a whine or groan when turning
  • The belt is squealing or the battery light is on too

Possible causes

  • Low fluid or a leak
  • Belt or pulley
  • Electric steering module or motor
  • Charging-system voltage problem

What you can check

  • Power-steering fluid level, if the vehicle has a reservoir
  • Belt condition

What not to do

  • Do not drive in heavy traffic with intermittent assist

Recommended next step: Request an inspection and tell us whether the assist is heavy all the time or comes and goes.

Steering & suspension

Maintenance reminder

A mileage- or time-based reminder set by the vehicle. It does not indicate a fault — it means an interval was reached.

Can you still drive it?

Yes.

Can we inspect or diagnose it?

Yes — mobile oil service and scheduled maintenance at your location.

More urgent when

  • You cannot remember the last oil change
  • The oil looks dark and low on the dipstick
  • The vehicle is used for delivery, towing or heavy short-trip driving

Possible causes

  • Oil-life monitor reaching zero
  • Mileage-based service interval
  • Time-based reminder

What you can check

  • Oil level and condition
  • Service records
  • The owner's manual interval

What not to do

  • Do not reset it without actually performing the service

Recommended next step: Run our Vehicle Maintenance Guide, then book what is actually due.

Vehicle Maintenance Guide

Reduced-engine-power warning

The engine computer has intentionally limited power to protect something. It is a protective mode, triggered by another fault.

Can you still drive it?

Only far enough to get somewhere safe. Acceleration is limited, which makes merging and intersections risky.

Can we inspect or diagnose it?

Yes — diagnostics to find the fault that triggered the protection mode.

More urgent when

  • The Check Engine Light is on or flashing too
  • The vehicle will barely accelerate
  • The temperature gauge is climbing

Possible causes

  • Throttle body or pedal-position sensor
  • Airflow or boost fault
  • Overheating protection
  • Charging or voltage fault

What you can check

  • Whether the pedal responds at all
  • Whether it clears after a restart

What not to do

  • Do not merge onto a highway in this mode
  • Do not keep driving it in traffic

Recommended next step: Get off the road and request diagnostics before driving it further.

Mobile diagnostics

What to do next

Tell us which light is on, whether it is steady or flashing, and what the vehicle is doing. That is usually enough for us to tell you whether it needs us today.

Let's keep your vehicle healthy.

Tell us the vehicle, the location and what you're noticing. We'll come to your home, workplace or business.