In this guide, we look at common problems that cause Porsche PSM failure and how to reset Porsche PSM light yourself. PSM stands for Porsche Stabil
Troubleshooting Porsche Check Engine Light
Is the check engine light on your Porsche staying on or flashing? In this guide, we go over common problems that trigger the Porsche check engine light and reset it.
What does the check engine light mean on a Porsche?
Porche check engine light comes on when the On-Board Diagnostic (OBD) system detects a problem. "Fault of the engine control system" and "Check Engine Visit workshop" error messages may also come up on the dashboard.
Porsche check engine light may come on for something as simple as a loose gas cap. Still, it can also indicate an engine, transmission, or Evaporative Emission Control System (EVAP) problem.
It can be hard to pinpoint the source of the problem without an OBD-II scanner, as a whole range of faults can trigger the check engine light on a Porsche.
Here are a few symptoms you may notice when your Porsche check engine light comes on.
- Engine runs rough
- Engine Misfire
- Lack of power
- Poor throttle response
- Unusual engine sound
- Smoke from the exhaust
- The vehicle goes into limp mode.
How to Reset Porsche Check Engine Light
Although there are some steps you can try, like checking the gas cap or looking for anything loose under a hood, you will usually be pretty much in the dark without reading the diagnostic trouble codes (DTCs).
Porsche check engine light should only be reset after you read the codes and fix the problem.
- Locate the OBD-2 port under the dashboard and plug in your scanner.
- Turn on the ignition and allow the scanner to power up.
- Press ENTER and select your Porsche model from the list.
- From the main menu, scroll down to Read Codes. Fault codes will show on your LCD along with a description of the problem. Write down all the codes and do further research to understand the problem better. Find the problem and fix it.
- Go back to the main menu and select Clear Fault Codes, then press OK. The check engine light on your Porsche will reset.
These instructions work on all 1996 and newer Porsche vehicles, including Macan, Cayenne, Panamera, Boxster, Cayman, or 911.
What Causes the Check Engine Light on a Porsche?
The most common problems that cause the check engine light on a Porsche are worn spark plugs, bad oxygen sensor, or a loose gas cap.
Spark Plugs: It is not unusual to experience misfires, especially on V8 engines with direct fuel injection. If this happens intermittently and without any apparent pattern, it is probably down to dirty spark plugs. Additionally, as poor fuel quality can cause this, make sure to use premium fuel only. Codes: P0300 to P0308
Secondary Air Pump: Older cayennes have secondary air pumps, which inject fresh air into the exhaust manifolds to lower emissions. However, this system can cause several problems. With time, air hoses can become very brittle and break under vibration. Another common failure point is the pump itself, as fan rotors brake-off. Not only this will cause insufficient airflow, but broken off pieces can block the regulating valve downstream. Codes: P0491 or P0492
Mass Air Flow Sensor - Boxer engines are seemingly prone to running lean issues, causing rough idle and hesitation when accelerating. In many cases, this will be caused by a dirty MAF sensor and can be solved with a bit of MAF cleaner. It is also possible that upstream O2 sensors are faulty and give incorrect readings, in which case replacement is the only solution. Lastly, check the intake hoses and manifold for any vacuum leaks. Codes: P1128 or P1230
EVAP Leaks: The EVAP system is another common failure point, as it tends to develop various leaks. This will not cause any running issues, but you may notice a strong fuel smell. In addition to possible cracked lines and hoses, a purge valve can leak. Lastly, V8 engines have a vacuum pump located at the back of the engine. It supplies vacuum for the whole engine, including the EVAP system. Related codes: P0455
High-Pressure Fuel Pump: Engines with a direct injection can suffer from high fuel pressure system problems. It is usually caused by an HP pump or pressure sensor failures. This will result in various, mostly random running issues, ranging from poor idle, stalling to cutting out at higher engine speeds. In any case, a defective part will need to be replaced. Code: P1025
Camshaft Position Sensor: All V8 engines have Variable Valve Timing and can suffer from camshaft position sensor related problems. This can cause very rough idle combined with stalling while running seemingly fine on higher RPMs. Sensors are located at the backside of the engine. Code: P0344
Gas Cap: A loose, damaged, or missing gas cap can trigger the check engine light on a Porsche. A loose gas cap can allow fuel vapors to escape, which in turn decreases fuel economy. Plus, it is also increasing harmful emissions, which is why the check engine light comes on.
Faulty Oxygen Sensor: A bad oxygen sensor can trigger the Porsche check engine light to come on. The oxygen sensor provides information on the air-fuel mixture. A bad oxygen sensor can cause the engine control unit (ECU) to send too little fuel or too much fuel to the engine.
Failing Catalytic Converter: A catalytic converter can clog, causing too much exhaust backpressure in the combustion chamber. A failing or clogged catalytic converter can cause an engine misfire, and the check engine light may flash. It will decrease fuel economy, and the vehicle may go in limp mode.
What does it mean when the Porsche check engine light is flashing on and off?
While a whole range of problems can cause a solid check engine light, if your Porsche check engine light is flashing, it always means that the engine is misfiring.
If the check engine light is flashing, unburned fuel is being dumped in the exhaust. The engine will shake, go in limp mode and maybe even overheat.
Your Porsche may have a bad spark plug, ignition coil, or clogged catalytic converter. Read the codes with an OBD-II scanner.
Operating a vehicle with the check engine light flashing can cause damage to your catalytic converter. It is not recommended to drive your Porsche while the check engine light is flashing.
Porsche Check Engine Warning Messages
Depending on the model, one of these messages will show on the instrument cluster:
- Check Engine Drive to the workshop.
- Motor - Diagnose Werkstatt
- The fault of the engine control system
- Reduced engine performance Possible to drive
- Check Engine Visit Workshop
Published on: Thursday, June 20, 2019.