Audi Glow Plug Light Flashing: (Causes & 100% Proven Fixes!)


Audi Glow Plug Light Flashing

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Driving your Audi and notice the glow plug light flashing? This could be signaling a number of possible issues.

In this guide, we’ll demystify what it means when your Audi’s Glow Plug Light is Flashing, delve into the common causes, and walk you through some potential fixes.

So next time this happens, you’ll have all the knowledge needed to decode this cryptic signal from your car’s dashboard!

If your Audi’s glow plug light is flashing while traveling, it’s indicative of potential issues. While you may be okay to drive temporarily, it’s crucial to diagnose the problem promptly. Common causes include a blocked DPF (Diesel Particulate Filter), malfunctioning EGR valve, dirty/bad throttle body, bad brake light switch, faulty crankshaft sensor, or a bad EGR solenoid.

Audi Glow Plug Light Flashing Issue:

The glow plug yellow warning light is flashing on a 2012 Audi A1 1.6 Diesel with 85,000 miles. After replacing the mass air flow sensor and differential pressure sensor, the issue persists.

Fault codes indicate sensor failures. Possible causes suggested by our mechanics include a faulty brake light switch, issues with the DPF, or a sensor part mismatch. Further diagnostics, including checking brake lights, fuses, and verifying correct sensor parts, are recommended.


  • Verify fault codes and ensure correct sensor installation.
  • Check brake lights for proper functioning and the brake light switch for faults.
  • Consider DPF issues, but note that symptoms may differ from a flashing glow plug light.
  • Examine fuses in the engine bay fuse box and inspect wiring for the mass air flow sensor.
  • Confirm sensor authenticity and compatibility with the vehicle.

Here In the below image You Can see the proof 👇, one of our reader who fixed his Audi Glow Plug Light Flashing problem by using our method this issue was due to faulty brake light switch and he replaced his brake light switch and the issue got fixed! 😍

Audi Glow Plug Light Flashing

What is the Audi Glow Plug Light?

The glow plug light, often shaped like a coil or a spring, plays an essential role in your Audi’s diesel engine operation. Here are few critical points to understand about this significant feature:

  • Indicator of Pre-heating Process: When you turn on the ignition, it illuminates as the glow plugs warm up for smoother and efficient starting.
  • Diesel Engine Assistant: Primarily found in diesel engines, it helps ignite fuel during colder temperatures when diesel struggles to catch fire.
  • Warning Sign: If the light starts flashing while driving or stays lit post-engine start, it signals potential issues with your vehicle’s glow plugs or related components.
Solid (Ignition On)Pre-heating process underway
Flashing/Stays Lit (While Driving)Possible issue with glow plugs/component

Remember these key numbers:

  1. The preheating phase usually takes around 2 – 6 seconds.
  2. Ignoring the warning can lead to serious engine damage – potentially costing $1000+ for repairs.

In conclusion: Don’t ignore a flashing or lit-up Audi glow plug light!

Why Is My Audi Glow Plug Light Flashing?

Your Audi’s glow plug light may flash due to several reasons. Here are the most common causes:

  • Faulty Glow Plugs: If one or more of your car’s glow plugs are defective, it can trigger the flashing light.
  • Issue with the Glow Plug Relay: The relay controls power supply to the glow plugs. A problem here could result in an intermittent warning sign.
  • Engine Problems: Engine malfunctions like compression issues can cause this too.
– Faulty Glow Plugs– Replace damaged glow plugs
– Issue with the Glow Plug Relay– Check and replace if necessary
– Engine Problems– Get a comprehensive engine checkup

Remember these steps:

  1. Identify which spark plug is causing trouble using an Ohm meter.
  2. Remove and replace faulty ones (if any).
  3. Test your vehicle after each step.

Note: Always seek professional help when dealing with engine issues!

Common Causes of a Flashing Audi Glow Plug Light:

The glow plug light on your Audi can start flashing due to several reasons. Here are some common causes:

  • Faulty Glow Plugs: If the glow plugs in your engine become faulty or wear out, the warning light may flash.
  • Faulty Brake Light Switch
  • Fuel System Issues: Problems with fuel injectors, fuel pump, or fuel filter can cause the warning light to flash.
  • Faulty Relay Module: A malfunctioning relay module could trigger a flashing glow plug light.

Faulty Glow Plugs:

Audi’s diesel engines rely heavily on their glow plugs for optimal performance. Over time they can wear out and lead to:

  1. Difficulty starting the vehicle.
  2. Increased emissions.
  3. Poor engine performance.
Hard StartThe car takes longer than usual to start
High Emission LevelsExcess smoke from exhaust indicates high emission levels
Reduced Engine PerformanceLoss of power while accelerating

Fuel System Issues:

Issues with components in the fuel system could also lead to a flashing glow plug light:

  • Clogged Fuel Injectors: These prevent adequate fuel flow which results in poor engine performance.
  • Malfunctioned Fuel Pump: This might not deliver enough fuel causing loss of power and hard starts.
  • Dirty Fuel Filter: A dirty filter restricts proper flow of gasoline through it eventually affecting overall functioning.

Faulty Relay Module:

Finally, if there’s an issue with your car’s relay module (which controls how current is sent to various parts), this could result in a blinking warning sign too!

In conclusion, always pay immediate attention when you notice that pesky little light flickering! It’s definitely signaling something important about your Audi’s health!

You can also watch this video guide:

How to Diagnose a Faulty Glow Plug in Your Audi?

When the glow plug light starts flashing on your Audi’s dashboard, it’s an indicator of potential issues with the engine or the glow plugs themselves. Here are some steps you can take to diagnose if your glow plug is faulty.

  1. Observe the Warning Light If the warning light continues flashing after starting your car, this might imply a problem with one or more glow plugs.
  2. Start-Up Issues Experiencing difficulties while trying to start-up during cold weather? This could be due to malfunctioning glow plugs, as they help heat up for diesel combustion.
  3. Examine Engine Performance Misfires and reduced power output may hint at defective glow plugs causing uneven fuel combustion.
  4. Diagnostic Scan Tool Use an OBD-II scanner tool available at auto parts stores or online marketplaces like Amazon.
1Connect your device into diagnostic port under steering wheel
2Turn ignition key ON but don’t start engine
3Follow instructions on screen

If you find trouble codes related to circuit failures (P0380-P0386), then it confirms a faulty glow plug issue.

  1. Physical Inspection For further confirmation, remove and visually inspect each plug for wear and tear damage using these steps:
  • Disconnect battery negative terminal
  • Remove engine cover
  • Locate and disconnect electrical connector from each plug
  • Unscrew using appropriate socket wrench size

Look out for eroded electrodes indicating that replacement is needed.

Remember, always consult an expert mechanic when dealing with intricate components such as these!

Steps to Fix a Flashing Audi Glow Plug Light:

If your Audi’s glow plug light is flashing, it’s time to take action. Follow the steps below:

  1. Identify the Problem: Use an OBD2 scanner to identify any error codes.
  2. Replace The faulty brake light switch.
  3. Check the Glow Plugs: Inspect each glow plug in your engine. If one is faulty, replace it.
  4. Inspect Wiring and Connectors: Make sure there are no frayed wires or loose connectors.

If these steps don’t solve the problem, consider these potential causes:

Potential CauseSolution
Faulty Glow Plug RelayReplace relay
Engine Control Unit (ECU) IssuesHave ECU inspected by professional

Don’t ignore a flashing glow plug light! Your car may still run but ignoring this could lead to more serious problems down the line like poor fuel economy or damage to your vehicle’s engine.

Tools needed for fixing an Audi glow plug issue:

Fixing the glow plug issue in your Audi doesn’t have to be a daunting task. With the right set of tools, you can undertake this job with confidence. Below is a list of essential tools that you’ll need:

  • OBD2 Scanner
  • Socket Set
  • Torque Wrench
  • Screwdriver Set
  • Multimeter

OBD2 Scanner:

An OBD2 scanner is crucial as it helps identify error codes that could indicate potential glow plug issues.

Socket Set:

A complete socket set comes handy while removing and replacing faulty plugs.

Torque Wrench:

Using a torque wrench, ensures correct tightening force on each new glow plug installed, preventing damage due to over-tightening or under-tightening.

Screwdriver Set:

A comprehensive screwdriver set will enable removal of any screws obstructing access to the spark plugs.


Finally, use a multimeter to test resistance across the old and new glow plugs before installation. If resistance values are similar, there likely wasn’t an issue with your old one(s).

To simplify things further, here’s how these tools come into play during the process:

StepTool Used
1Use OBD2 scanner to identify error codes
2Utilize socket set & screwdrivers for removal/replacement
3Employ torque wrench for proper installation
4Apply multimeter for testing prior/post replacement

Ensure you have all these at hand before starting the repair process. Happy DIY-ing!

Can I Drive My Audi With a Flashing Glow Plug Light?

You might be thinking, “Can I still drive my Audi even if the glow plug light is flashing?” The answer really depends on the severity of your car’s condition.

Here are some points to consider:

  • Immediate Risk: Driving with a flashing glow plug light can potentially cause damage to your vehicle. It suggests an issue with the engine, which could lead to severe problems if not addressed promptly.
  • Damage Severity: The potential harm will depend on what’s causing the light to flash in the first place. Issues range from minor faults like a loose wire, all way up to major ones like full-blown engine failure.

Here is a simple table illustrating potential issues and their consequences:

IssuePotential Consequences
Loose WireMay lead to sporadic performance or sudden stalling while driving
Faulty Glow PlugCould prevent car from starting especially during cold weather conditions where it plays crucial role for diesel engines
Major Engine FailureCould cause significant damage leading towards costly repairs

To sum it up,

  1. Is it possible? Yes.
  2. Is it recommended? No.

Prevention is always better than cure; get your vehicle checked by a professional as soon as you notice any warning lights flickering on your dashboard!

Preventive Measures for Avoiding Future Issues:

Avoid running into problems with your Audi’s glow plug light flashing in the future. Follow these straightforward steps:

  1. Regular Servicing: Schedule regular services to keep all vehicle systems, including the glow plugs, functioning optimally.
  2. Glow Plug Inspection: Have the glow plugs checked during every service. This can prevent potential issues from escalating.
  3. Quality Parts: Only use high-quality replacement parts if you need a new set of glow plugs or other components.
  4. Driving Habits: Avoid short trips that don’t allow your car’s engine to reach operating temperature; this could lead to premature wear and tear on the glow plugs.
  5. Fuel Quality: Always fill up at reputable gas stations to ensure good quality diesel fuel which is crucial for optimal performance of glow plugs.

Here’s a simple table summarizing key points:

Regular ServicingEnsures overall vehicle health
Glow Plug InspectionIdentifies potential issues early
Quality PartsIncreases lifespan of components
Driving HabitsProtects against premature wear and tear
Fuel QualityMaintains optimal performance

Remember: Prevention is better than cure!

When should I seek professional help?

Knowing when to get a professional involved is key in maintaining the health of your Audi. Here are some signs that it’s time to take your car to a specialist:

  • If the glow plug light continues flashing after you’ve tried restarting the engine.
  • You’re experiencing other warning lights on your dashboard along with the glow plug light.
  • Your vehicle struggles to start or doesn’t start at all.

In these cases, seeking out an expert mechanic becomes important. They have specialized knowledge and tools necessary for diagnosing and repairing complex automotive issues. Remember, ignoring these signals can result in more serious damage over time.

Consider reaching out for professional help in certain scenarios:

  1. Repeated Glow Plug Failure: If new plugs keep failing, there might be underlying issues causing this – which only a qualified technician can diagnose accurately.
  2. Poor Fuel Economy: A malfunctioning glow plug system may lead to excessive fuel consumption.
  3. Decreased Power & Acceleration: Faulty glow plugs often cause loss of power or sluggish acceleration.

If you spot any of these symptoms, don’t delay visiting an auto repair shop immediately!

SymptomProfessional Help Needed?
Flashing Glow Plug LightYes
Other Warning Lights OnYes
Vehicle Struggles To Start Or Doesn’t Start At AllYes
Repeated Glow Plug FailureYes
Poor Fuel EconomyYes
Decreased Power & AccelerationYes

Remember: It’s always better safe than sorry when it comes to potential car troubles!

Frequently Asked Questions about the Audi Glow Plug System

What does it mean when my Audi glow plug light is flashing?

This typically indicates a problem with your engine or fuel injection system. It’s best to have your vehicle inspected by a professional.

Can I still drive my Audi if the glow plug light is flashing?

While you may still be able to operate your vehicle, it’s not recommended as it could lead to more serious damage.

How do I fix a flashing glow plug light?

Inspect your vehicle for obvious signs of damage.
Check if there’s any issue with fuel delivery.
Look at each individual glow plug (if applicable).
Consult an automotive professional if necessary.

What causes the glow plug light to flash?

Several issues can cause this, including:
Faulty glow plugs
Problems with the fuel injection system
Engine malfunctions

Faulty Glow PlugsThese are crucial for starting diesel engines in cold weather. If they’re faulty, it could trigger the warning light.
Fuel Injection IssuesYour car might be having trouble delivering fuel to the engine properly.
Engine MalfunctionsThere may be other mechanical problems affecting your engine’s performance

Remember that ignoring these indications can result in costly repairs down the line!

Conclusion and final thoughts

There’s no need to panic when the Audi glow plug light starts flashing. This is your vehicle’s way of letting you know something needs attention.

Causes can range from minor inconveniences like a loose wire, to more serious issues requiring professional inspection such as fuel injector problems or faulty glow plugs.

In essence, maintaining your car in top-notch condition and addressing potential issues promptly will prevent any major complications down the line.

Remember that regular maintenance checks are vital for prolonging your Audi’s lifespan and ensuring optimal performance on the road.

When it comes to dealing with a flashing glow plug light, always consult an expert if you’re unsure about what steps to take next. Safety should always be your priority.

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