SEAT Warning Lights Ultimate Guide, Everything You Need to Know & How to Fix Them

Oil Pressure Warning

Level of Importance: Critical

How to fix

This light means the engine has lost oil pressure, and you must stop the car as soon as it is safe to do so, turn off the engine immediately, and do not drive any further.

Here, you should then check the engine oil level using the dipstick (once the engine has cooled a little) and top it up if necessary.

However, if the level is correct, the fault is more serious, and possibly could indicate that you have a failed oil pump on your hands.

In this case, you should look to get the car towed to your nearest garage for service.

What Happens If You Do Not

Continuing to drive here will cause catastrophic, irreversible engine damage within minutes, leading to a complete engine seizure and a very expensive repair, so we would suggest you don't do that.

Brake System Warning

Level of Importance: Critical

How to fix

First, you should check that your handbrake (often called the parking brake) is fully released. If it is, this light signifies a serious fault in the braking system, which is most likely that the brake fluid level is dangerously low.

Here you should, for instance, pull over safely, stop the engine, and call for roadside assistance.

You should also not attempt to drive the car any further either.

What Happens If You Do Not

You risk a partial or complete failure of the brakes, which could then make it impossible to stop the car safely, which is extremely dangerous.

Engine Management Light (ECU)

Level of Importance: Warning

How to fix

Here, a fault has been detected by the engine's computer, and it could be anything from a loose fuel cap to a faulty sensor or a more serious engine problem.

As a result, you should book your car into a garage, workshop, or ideally, a SEAT specialist for a diagnostic check, so that they can read the fault code and identify the issue.

What Happens If You Do Not

Ignoring the light can lead to poor performance, increased fuel consumption, and higher emissions (which is an MOT failure), and a minor fault could also develop into a major, more costly repair as well.

Power Steering Warning

Level of Importance: Warning

How to fix

A fault has occurred in your power steering system. Sometimes, stopping the car and restarting the engine can reset the system and clear the light.

However, if the light remains on, the steering will feel very heavy and difficult to turn, and you should take the car to a garage to get the steering fault inspected.

What Happens If You Do Not

The car will be very difficult to manoeuvre, especially at low speeds or when parking. While it will remain drivable, it is not safe to use long-term in this condition.

Tyre Pressure Warning (TPMS)

Level of Importance: Warning

How to fix

This light means at least one of your tyres has low pressure. As a result, you should find a safe place to stop and visually inspect your tyres.

Here you also want to use a tyre pressure gauge to check all tyres and inflate them to the correct inflation pressures recommended in your owner's manual or on the door sill sticker.

Then, after inflating, you may need to reset the TPMS system through your car's infotainment screen to clear this light entirely.

What Happens If You Do Not

Driving on under-inflated tyres leads to poor handling, increased fuel consumption, uneven tyre wear, and increases the risk of a dangerous blowout.

Glow Plugs Warning (Diesel)

Level of Importance: Informational / Warning

How to fix

When you turn the ignition on, this light shows that the glow plugs are warming the engine cylinders. Note: This preheating process really is key to giving you a smooth overall start.

If the light flashes while you are driving, it indicates that you have a fault with at least one of the glow plugs, which will need to be replaced by a mechanic.

What Happens If You Do Not

If a glow plug is faulty, the car will become difficult to start, especially in cold weather, and may run roughly with increased emissions.

Traction Control (ESP/ESC) Warning

Level of Importance: Informational / Warning

How to fix

If the light is flashing, it's informational - the system is actively working to prevent a skid on a slippery surface for instance.

However, if the light stays on constantly, it means there is a fault in the system, or it has been manually turned off.

If there is a fault, you should get it checked by a garage as soon as possible.

What Happens If You Do Not

The car's electronic stability safety net is disabled, and this significantly increases the risk of losing control and skidding in poor weather or during an emergency manoeuvre.

Lane Assist

Level of Importance: Informational

How to fix

This is not a fault, as a green light shows that the Lane Assist system is active and able to see the lane markings on the road.

If the light is orange or yellow, though, it means the system is on, but it cannot currently function, perhaps due to poor road markings or bad weather.

If it indicates a fault, it will need checking by a mechanic.

What Happens If You Do Not

This is a driver aid, not a fault, so no action is required unless the system shows as a permanent fault, in which case this safety feature will be unavailable to you.

Seatbelt Reminder

Level of Importance: Informational

How to fix

This is a simple but critical reminder, as it means the driver or a front passenger has not fastened their seatbelt.

Once they buckle up the light and chime go away, if it does not, the sensor that detects the seatbelt may be broken and it may need servicing.

What Happens If You Do Not

Aside from the persistent warning chime, you are breaking the law and are not protected in the event of a crash, massively increasing your risk of serious injury or death occurring.

Low Fuel Warning

Level of Importance: Informational

How to fix

Your car is running low on fuel, and the reserve tank is now in use. As a result, you should drive to a petrol station to refuel as soon as you can.

What Happens If You Do Not

You will eventually run out of fuel completely, and the car will stop.

Also, running the tank dry can also pull sediment from the bottom of the tank into the fuel system, potentially damaging the fuel pump, meaning you will need a replacement as a result to fix this.

Brake Pad Warning

Level of Importance: Warning

How to fix

A sensor has detected that your brake pads have worn down to their minimum safe thickness. As a result, you should book your car into a garage to have the brake pads replaced soon.

What Happens If You Do Not

Your braking performance will be significantly reduced, and if you ignore it for too long, the metal backing of the pads will grind against the brake discs, causing severe damage and a much more expensive repair job for you as well.

Gearbox Fault

Level of Importance: Warning

How to fix

The car's computer has detected a fault with the automatic transmission, and the car may feel jerky or go into a 'limp mode' with limited power and gears.

You should drive cautiously to a garage for an immediate diagnostic check, and if you are not sure, pull over and wait for roadside recovery.

However, on a manual car, a serious gearbox issue could also be related to a problem with the clutch.

What Happens If You Do Not

Continuing to drive could cause severe and irreparable damage to the gearbox, which is one of the most complex and expensive components to replace in a car.

Adaptive Cruise Control (ACC) Fault

Level of Importance: Warning

How to fix

This light means there is a fault with the ACC system, which is often, because the radar sensor on the front of the car is blocked by dirt, snow, or ice.

Safely pull over and clean the sensor (usually in the lower grille or behind the SEAT badge).

However, if the light persists, the system needs to be checked by a mechanic.

What Happens If You Do Not

The adaptive cruise control feature will not work, and in most cases, your standard cruise control will also be disabled.

The car is safe to drive otherwise.

Fuel Filter Warning (Diesel)

Level of Importance: Warning

How to fix

This light indicates that water has collected in the fuel filter, and water in the diesel system can cause serious damage.

As a result, you should take the car to a garage to have the water drained from the filter, and do not delay this.

What Happens If You Do Not

Water can cause corrosion and damage to high-precision components like the fuel injectors and high-pressure fuel pump, leading to poor running and extremely expensive repairs.

Who is Sinclair SEAT?

Here at Sinclair SEAT, we are part of the Sinclair Group, a network of authorised main brand car dealers in the United Kingdom and a prominent automotive retailer in Wales.

Consequently, we can offer a wide range of new and used SEAT and CUPRA vehicles and comprehensive automotive services such as maintenance, repairs, and financing options, as we are also regulated by the Financial Conduct Authority (FCA).

Located in Swansea, here at Sinclair SEAT, we are dedicated to providing you with high-quality customer service and have become a key SEAT dealership in South Wales for these Spanish car brands as a result.