What Is the P1406 Code?
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The P1406 code is a manufacturer-specific code that, in this context, indicates that there’s a problem with the Exhaust Gas Recirculation (EGR) position sensor, which detects the position of the EGR valve shaft. This shaft is supposed to open and close with specific signal voltages; if the PCM notices that the value is at least 10% further in its cycle than it would expect, that indicates that there’s a problem with the EGR valve or the sensor, which triggers this problem.
More About the P1406 Code
Because the P1406 code is a manufacturer-specific code, that means your vehicle may have a different readout for the code depending on exactly what make and model it is. Many of these codes do similar things within the vehicle but will not have an identical readout.
- Codes referring to the Differential Pressure Feedback (DPFE): Ford, Lincoln, Mazda, Mercury
- Intermittent Loss Of Camshaft Position Or Crankshaft Position Sensor: Dodge
- Turbo Pressure Sensor Range/Performance Problem: Toyota
Remember, the description of a code is just as important, if not more so than the code itself. While the OBD-II is a great starting point to understand these codes, it shouldn’t override what your engine is actually telling you the problem is. Check the description before you default to a problem your vehicle may not even have.
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What Are the Symptoms of a P1406 Code?
The check engine light is the most common symptom of the P1406 code, and in some cases, it may be your only symptom. However, in other cases, you may find it difficult to start the engine, and the engine may have irregularities – reduced engine power, issues with idling, general unexpected stalling, and even knocking when you’re driving it more quickly.
What Are Some Causes of a P1406 Code?
The main reasons you’ll probably see the P1406 code all have to do with issues regarding your EGR shaft circuit or valve. First, you might want to check out moving parts in the EGR valve, which may have excessive levels of wear, and the valve itself, which may simply have a poor condition. If these aren’t the problem, then you might be looking for issues in your EGR shaft circuit, which may have faulty wiring or connectors. Finally, you may want to check for the hoses connecting to the EGR, which may be disconnected or plugged.
How Serious Is the P1406 Code?
The EGR redirects exhaust gasses that are generally considered inert, not capable of supporting combustion. It is used to displace some of the air/fuel mixture that comes into the combustion chamber, reducing temperatures within the combustion chamber and limiting NOx emissions. That means any issues with your EGR may cause your vehicle to fail an emissions test, and in some cases, it may also create a negative experience when driving. That’s why it’s best to fix this problem as soon as possible; issues with your EGR negatively impact your driving experience and your vehicle’s overall processing.
Can I Still Drive with a P1406 Code?
In most situations, you will still physically be able to drive if you have a P1406 code active in your vehicle. However, that doesn’t mean it’s a good idea. You’ll be putting out more emissions into the environment, and you’ll also be experiencing a less-effective driving experience. If you want your vehicle to run in the smoothest way possible, then you should take it in when it’s showing the P1406 code.
How Easy Is It to Diagnose a P1406 Code?
The good news is that the diagnostic process for the P1406 code can be very simple. There are not very many causes to look into for this code, and those causes generally all occur in one section of the engine. Although you should have at least a fair bit of knowledge surrounding how your vehicle’s EGR system functions, you may be able to determine the problem yourself.
How Difficult Is It to Inspect a P1406 Code?
The main issue with handling a P1406 code yourself is that the inspection and fixing process is more difficult than the diagnostic process on average. It’s important to recognize that this process can be tricky and cause serious issues within your vehicle if you mess it up, which is one of the reasons that many people choose to entrust this part of the process to an expert instead.
Need Additional Help with Your P1406 Code?
Even if you generally know where the problem is, you might not feel comfortable fixing that problem on your own, especially not when it comes to such a potentially delicate section of your vehicle like your EGR. If you’re worried about negatively impacting your vehicle’s EGR, you should just turn the vehicle over to a professional to fix any problems you might be having.
To do this, use KBB to find a repair shop in your area. You can find a wide array of repair shops across the United States, and KBB can help you find a great one nearby.
Additionally, this isn’t always the only code you’ll be experiencing. Check out the KBB OBD-II database to learn more about the various codes you may see your engine throwing.
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