You saw a mysterious code on the dashboard or in the diagnostic scanner P101520 and don't know what to do with it? This error does not apply to standard OBD-II codes, so it causes confusion even among experienced car owners. Unlike the usual P0300 (misfire) or P0171 (lean mixture), combination P101520 most often associated with manufacturer error codes for specific car brands, and not with a universal diagnostic system.

In this article we will look at what is hidden behind the code. P101520, on which machines it occurs, what malfunctions it can indicate and how to fix them yourself. You will also learn why ignoring this error can lead to serious damage - from increased fuel consumption to failure of the turbine or catalyst.

What is code P101520 and where does it come from?

Code P101520 not included in the standard protocol OBD-II, which is used by all cars after 1996. This means that it is not universal and can have different meanings depending on:

  • 🚗 Car makes and models (more common in Volkswagen, Audi, Skoda, Seat).
  • 🔧 Engine type (gasoline/diesel, naturally aspirated/turbocharged).
  • 📅 Year of manufacture (usually cars from 2010–2020).
  • 💻 Software versions control unit.

In most cases P101520 associated with malfunctions in the fuel injection system or deviations in sensor operation, but the exact decoding depends on the manufacturer. For example:

  • 🔥U VW/Audi with engines 1.8 TSI or 2.0 TSI this code may indicate problems with injectors or low fuel rail pressure.
  • ⚡ U Skoda Octavia or Seat Leon - on incorrect signals from the camshaft position sensor.
  • ⛽ For diesel engines (for example, 2.0 TDI) - on particulate filter clogged or EGR valve malfunction.

It is important to understand that P101520 - this is not an independent error, but consequence code, which appears due to another primary problem. Therefore, simply resetting it through a scanner is not enough: a full diagnosis is required.

📊 On what brand of car did you see code P101520?
Volkswagen
Audi
Skoda
Seat
Other brand
I don't know

What cars is P101520 found on: compatibility table

To more accurately determine the cause of the error, you first need to understand which car group your car belongs to. Below is a table with the most common cases of occurrence P101520:

Make/Model Engine Probable Cause Years of manufacture
Volkswagen Golf, Passat, Tiguan 1.8 TSI, 2.0 TSI (EA888) Faulty injectors, low fuel pressure 2012–2018
Audi A3, A4, Q3 1.4 TFSI, 2.0 TFSI Problems with the turbo or boost sensor 2013–2019
Skoda Octavia, Superb 1.6 MPI, 2.0 TDI Clogged diesel particulate filter (DPF) or EGR valve 2010–2017
Seat Leon, Ibiza 1.2 TSI, 1.8 TSI Incorrect data from the camshaft sensor 2014–2020
Volkswagen Amarok 3.0 TDI V6 Problems with the Common Rail system 2016–2021

If your model is not in the table, this does not mean that the code P101520 cannot appear. For example, it is sometimes found on Ford or Opel with engines developed jointly with VW Group. In such cases, the cause must be sought by analogy with nearby models.

⚠️ Attention: By car BMW, Mercedes or Toyota code P101520 practically never occurs. If you see it on such a machine, there is a high probability that the scanner incorrectly interpreted other code (for example, P1015 + 20 as individual errors).

The main causes of error P101520

As already mentioned, P101520 - this is a consequence, not a root cause. Let's look at the most common malfunctions that lead to its appearance:

1. Problems with the fuel system

  • 🛢️ Clogged injectors (especially relevant for engines TSI with direct injection).
  • 🔧 High pressure fuel pump malfunction (on diesel or gasoline engines with a turbine).
  • 📉 Pressure drop in the fuel rail due to regulator wear or leaks.

2. Problems with the ignition system

  • ⚡ Misfires in one or more cylinders.
  • 🔥 Faulty spark plugs or coils (on gasoline engines).
  • 🛠️ Wear of high-voltage wires (on older models).

3. Sensor malfunctions

  • 📊 Camshaft Position (CMP) Sensor produces incorrect signals.
  • 🌡️ Coolant temperature sensor out of order.
  • 💨 Mass Air Flow (MAF) Sensor dirty or damaged.

4. Problems with the turbine or boost system

  • 🌀 Air leak in the intercooler or pipes.
  • 🔄 Wastegate valve malfunction (on turbocharged engines).
  • 🛑 Turbine jammed due to lack of oil.

Most often the code P101520 appears in combination with other errors, for example:

  • P0300 — random misfires;
  • P0171 — lean air-fuel mixture;
  • P0299 — low boost pressure;
  • P2563 — problem with the turbine.

If together with P101520 Other errors also appear, you need to start diagnosing them with them - this will narrow the range of possible causes.

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Before starting diagnostics, check if the code appears P101520 after refueling at an unfamiliar gas station. Sometimes low-quality fuel causes false sensor alarms. Try draining the gasoline/diesel and refilling with proven fuel with the octane rating recommended by the manufacturer.

How to diagnose error P101520: step-by-step instructions

To pinpoint the cause P101520, a comprehensive diagnosis will be required. Below is an action algorithm that will help narrow down the range of problems.

Step 1: Read all errors by scanner

Use a diagnostic scanner (eg Launch X431, Autel MaxiCOM or even budget ELM327) for reading all saved codes. Please note:

  • 🔹 Permanent errors — they are not reset after the ignition is turned off.
  • 🔹 Related Codes (for example, P0301 - misfires in cylinder 1).
  • 🔹 Real-time sensor values (fuel mixture parameters, boost pressure, temperature).

Step 2: Check the fuel system

For gasoline engines:

  • 🔧 Measure fuel rail pressure (norm: 3–5 bar depending on model).
  • 🛢️ Check it out fuel pump performance (must pump at least 1–1.5 l/min).
  • 🔍 Take a look injectors for leaks or corrosion.

For diesel engines:

  • 🛠️ Check it out common rail system pressure (norm: 1500–2000 bar).
  • 🔥 Make sure there are no air in the fuel line.

Step 3: Diagnose the Ignition System

On gasoline engines:

  • ⚡ Check it out spark plugs for soot or damage.
  • 🔌 Measure ignition coil resistance (should be within 0.5–1.5 Ohm).
  • 🔄 Swap places coils or spark plugs between the cylinders - if the error moves, the problem is in them.

Step 4: Test the sensors

Using a multimeter or scanner, check:

  • 📊 Camshaft Position (CMP) Sensor - winding resistance should be 500–1000 Ohms.
  • 🌡️ Coolant temperature sensor - Resistance changes when heated.
  • 💨 Mass Air Flow (MAF) Sensor — voltage at idle 0.5–1.5 V.

Step 5: Check the turbo and boost system

For turbocharged engines:

  • 🌀 Take a look intercooler pipes for cracks or disconnections.
  • 🔧 Check it out wastegate valve - it should open without jamming.
  • 🛑 Make sure that the turbine does not play (rock the shaft by hand - play of more than 1 mm is unacceptable).

Read all errors with a scanner|Checking the pressure in the fuel rail|Testing injectors for performance|Diagnostics of spark plugs and ignition coils|Checking sensors (CMP, MAF, temperature)|Inspecting the turbine and pipes|Resetting errors and test drive-->

⚠️ Attention: If after resetting the errors the code P101520 appears again within 5-10 minutes, the problem is definitely in the hardware (sensor, wiring, mechanical failure). If the error returns after 50–100 km, the software or an intermittent failure (for example, poor contact) is to blame.

How to resolve error P101520: repair methods

The repair method depends on the identified cause. Below are the most effective solutions for different cases.

1. Cleaning or replacing injectors

If the problem is in the injectors:

  • 🔧 Ultrasonic cleaning (effective for light soiling).
  • 🛢️ Flushing with special liquid (for example, Liqui Moly Injection Reiniger).
  • 🔄 Replacing injectors (if cleaning did not help or there is mechanical damage).

The cost of replacing one injector VW/Audi — from 8,000 to 20,000 rubles (depending on the model).

2. Fuel pump repair

For gasoline engines:

  • 🛠️ Replacement filter mesh in the pump (costs 300–500 rubles).
  • 🔧 Repair or replacement pressure regulator (from 2,000 rubles).

For diesels:

  • 🛢️ Replacement plunger pair in high-pressure fuel pump (from 15,000 rubles).
  • 🔄 Check pressure valve (often fails on 2.0 TDI).

3. Replacing sensors

If the diagnostics showed a sensor malfunction:

  • 📊 Camshaft sensor (CMP) — replacement will cost 1,500–4,000 rubles.
  • 💨 Mass Air Flow (MAF) Sensor — the original costs 5,000–10,000 rubles, the analogue costs 2,000–3,000.
  • 🌡️ Temperature sensor - one of the cheapest (300–800 rubles).

4. Turbine repair

If the problem is in the boost system:

  • 🌀 Replacement intercooler pipes (from 1,000 rubles per set).
  • 🔧 Repair or replacement wastegate valve (3,000–8,000 rubles).
  • 🛑 Turbine overhaul (from 20,000 rubles) or replacement with a new one (from 50,000 rubles).

5. Software update

Sometimes P101520 appears due to control unit firmware glitches. In this case it will help:

  • 💻 Flashing the ECU (cost: 3,000–10,000 rubles).
  • 🔄 Resetting adaptations (free if you have a scanner).
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If after repair there is an error P101520 disappeared, but returned after a while, check quality of installed spare parts and correct connection of sensors. Often the problem returns due to defective parts or poor contact in the connectors.

Is it possible to drive with error code P101520?

The answer depends on what symptoms accompany the error:

Symptoms Is it possible to drive? Risks
The error is on, but the machine is working fine ✅ Yes, but not for long Possible hidden problems (for example, beginning wear of the turbine)
Floating speed, jerking during acceleration ⚠️ Only to the service station Risk of damage to the catalyst or particulate filter
Loss of power, black smoke from the exhaust ❌ No Possible engine overheating or turbine destruction
Check Engine is flashing (rather than staying on) ❌ No A flashing check indicates a critical malfunction (misfire, risk of detonation)

If together with P101520 appeared:

  • 🔥 Flashing Check Engine;
  • 💨 Thick white or black smoke from the exhaust;
  • 🛑 Knock or whistle from under the hood;
  • 🌡️ Engine overheating;

— It is prohibited to operate the car. Immediately turn off the engine and call a tow truck.

What happens if you ignore P101520?

Driving for a long time with this error can lead to:

- Catalyst failure (replacement will cost 30,000–100,000 rubles).

- Turbine destruction (blade fragments may enter the engine).

- Damage to pistons or valves due to detonation.

- Diesel particulate filter clogged (on diesel engines), which leads to a transition to emergency mode.

In the most severe cases it may be necessary engine overhaul (from 150,000 rubles).

Prevention of error P101520: how to avoid recurrence

To code P101520 did not return, follow these recommendations:

  • ⛽ Refuel only at proven gas stations (avoid questionable networks).
  • 🛢️ Use fuel additives (for example, Liqui Moly Speed Tec for gasoline or Diesel Purge for diesel) every 5,000 km.
  • 🔧 Change the fuel filter every 30,000 km (on diesel engines - every 15,000 km).
  • 🛠️ Check the condition of the spark plugs and coils every 60,000 km (even if they are still “working”).
  • 🌀 Monitor the condition of the turbine: After driving at high speeds, let the engine idle for 1-2 minutes.
  • 💻 Update your ECU firmware regularly (especially after renovation).

For diesel vehicles additionally:

  • 🛑 Do not turn off the engine immediately after loading (for example, after towing or long lifting).
  • 🔥 Use anti-gel in winter to avoid clogging the fuel system.
  • 🔄 Clean the EGR valve periodically (every 50,000 km).
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If your car is often stuck in traffic jams or driven in stop-start mode (short trips), once a month, take it to the highway and let the engine run at 3,000–4,000 rpm for 10–15 minutes. This will help clean the particulate filter (on diesel engines) and avoid coking of the injectors (on gasoline engines).

FAQ: Frequently asked questions about code P101520

Is it possible to reset error code P101520 without repair?

Yes, you can reset it with a scanner or by disconnecting the battery terminal for 10-15 minutes. However, if the cause is not resolved, the code will appear again. A reset without repair is only useful for checking whether the error is "false" (eg due to a temporary sensor failure).

How much does it cost to diagnose P101520 in the service?

The cost depends on the region and type of diagnosis:

  • 🔧 Computer diagnostics (reading errors) - 500–1,500 rubles.
  • 🛠️ Full diagnostics (checking pressure, sensors, turbine) - 2,000–5,000 rubles.
  • 🔍 Diagnostics with analysis (for example, checking injectors on a stand) - from 3,000 rubles.

At dealerships prices are 30–50% higher.

Could P101520 be caused by bad gasoline?

Yes, especially if the fuel contains many impurities or the octane number does not meet the engine requirements. In this case:

  • 🛢️ Drain low-quality fuel.
  • 🔧 Flush the fuel system with a special liquid.
  • 🔄 Replace the fuel filter.

If after this the error disappears, the cause was the fuel.

What should I do if P101520 appears after washing the engine?

Water probably got into the sensor connectors or the control unit. Actions:

  • 🔌 Dry the connectors with a hairdryer (without overheating!).
  • 💻 Check contacts for oxidation (clean if necessary WD-40).
  • 🔄 Reset the error and check if it appears again.

If the code returns, the wiring may be damaged and the harness will need to be replaced.

Could P101520 be the cause of failed chip tuning?

Yes, if the ECU firmware was performed incorrectly or is not suitable for your engine version. In this case:

  • 💻 Return stock firmware.
  • 🔧 Contact another tuning studio for reflashing.
  • 🛠️ Check if you got lost adaptation (they need to be reset and retrained).

Poor quality chip tuning can lead to detonation, overheating or accelerated engine wear.