The P code in a Honda Pilot will often be thrown one of your oxygen sensors are not functioning properly.
Typically, the code will be triggered by the upstream oxygen sensor before the converter. For most people the first sign that anything is wrong at all is the service engine soon light coming on. There are many things that can cause the P trouble code in your Pilot.
Here are the most common ones. Often, the oxygen sensor is the cause of P It would be a good idea to check the exhaust for leaks first.
You should be able to hear an exhaust leak easily underneath of the vehicle. Im just wondering if I need replace the catalytic converter or just some cleaning is required? Will get MPG at next refill. This is a neat experiment. I am the only driver.
Driving habit constant, no hauling or towing trailer. First 3 tanks of my ownership Cause Low tier pressure and dirty air cleaner. Last 20 tanks average after Repair tier and replace air cleaner Note last 3 tanks have been E 88, average Maybe this Honda cannot run 3 tanks in a row of this stuff. I will run this tank down and refill with regular I am doing and experiment to help with your low gas mileage.
Have you had a repair done to your emission system such as replace O2 senser or replace catalytic converter? As mentioned in this post. If so, did your light go out and milage come back up? When new window sticker, if equipped with 3. Have you kept an accurate record of your average Mile Per Gallon prior to this issue? Gas mileage decrease can be caused by symptoms in this article and may be a sign of inconstant driving habits or hard driving if you are sharing your vehicle Low tier pressure, dirty air cleaner, idle time remote start.
If this threshold is reached, the PCM will set code P, and illuminate warning light. In many cases, catalytic converter failure on these models could be postponed, if not prevented by reflashing the PCM with updated software, but how well or otherwise this worked depended on the amount of damage the catalytic converter had already suffered by the time the reflash was performed.
The most common causes of code P on late model Honda applications are engine vacuum leaks and fuel trim issues. The image above shows the location center of frame of the catalytic converter on a Honda Accord model. Note though that on many late model Honda applications, the catalytic converter and the exhaust manifold form an assembly close to the engine, and this assembly must be replaced as a unit when the converter fails.
Running a vehicle harder than usual for a few miles e. For example, if you typically fill your vehicle with the cheapest low-octane fuel, try running your vehicle on a few tanks of high-octane fuel.
Adding one gallon of lacquer thinner to ten gallons of gas at your next refuel may also be effective clearing out catalytic converter deposits. You can try either of these methods in combination with the Italian Tune-Up method. You may need to fix other engine problems in order to solve your catalytic converter problem. A lazy oxygen sensor might falsely indicate a catalytic converter problem, yet not set a DTC for itself.
A technician can determine if the sensor is responding as it should. Other engine problems, such as fuel trim running too rich or too lean, oil or coolant burning, or engine misfire problems could all lead to catalytic converter contamination or premature failure. Depending on the extent of the damage already done, fixing engine problems might save the catalytic converter from a meltdown. Exhaust leaks are common and can skew oxygen sensor readings without setting other DTCs.
Worn exhaust gaskets and corroded flex pipes are two common issues that are significantly less expensive and more effective than replacing a catalytic converter. Removing and cleaning the catalytic converter is another potential fix. After removing the catalytic converter, use a pressure washer to blast out any contaminants from the matrix.
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