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. NOTE: Since almost all of the possible causes of code P listed here will be indicated by dedicated codes other than P, all additional codes must be investigated and resolved in the order in which they were stored.
Failure to do this will almost certainly result in a misdiagnosis, and the unnecessary replacement of sometimes-expensive parts and components. For ANY warranty to be valid, proof of O2 sensor replacement at the time of converter replacement is required.
This is the leading cause of initial converter failure. In most cases this refers to perforation of the converter body only, nothing else. Since our converter bodies are stainless steel there is NO chance of rust-through.
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Clearance Items All Clearance Items. Country United States Canada. Conversely, and again assuming no oxygen sensor codes are present, but the signal from the downstream sensor remains relatively constant while the signal from the upstream sensor fluctuates between high and low, the DME draws the inference that the catalytic converter is working at a high efficiency rate.
However, since the proverbial devil lives in the detail, the DME is programmed to recognize when the signal from the downstream sensor begins to mirror the signal from the upstream sensor. On older vehicles, the minimum allowable efficiency rate can be as low as 75 percent, but on new or late-model vehicles, the minimum allowable threshold is typically between about 85 to 90 percent.
Thus, when the DMR recognizes that the efficiency of the affected catalytic converter is approaching, or has reached the minimum allowable efficiency threshold, it will set code P, and illuminate a warning light as a result. Many BMW models and especially BMW models with forced induction are known to consume huge quantities of oil- up to 1 quart per five hundred miles of driving and sometimes more.
While the manufacturer considers this oil consumption rate normal, its practical effect is to coat the catalytic metals in catalytic converters with a layer of unburnt or partially burnt oil, which prevents contact between the metals and the exhaust gas. As might be expected, this reduces the efficiency of catalytic converters on affected BMW models at hugely accelerated rates, and it is common to see complete catalytic converter failures on some BMW models occurring well within their mandated warranty periods.
Note that while it is possible to replace a catalytic converter on some BMW models on a DIY basis, this process usually involves removing heat shields, splash guards, and other parts to gain access to the exhaust system.
Therefore, the procedure can sometimes be challenging even for professional mechanics. Therefore we strongly recommend that you seek professional assistance with diagnosing and replacing catalytic converters on any BMW application. I already have a replacement O2 sensor. Hamed: It could be with the P code.
Were you able to test that circuit? You need to test the sensors. It is not a good idea to throw parts at the problem without testing 02 sensors. Basically, after the engine cooled down to warm, he removed the upstream 02 sensor bank 1 and sprayed sea foam into the hole.
After he reinstalled the sensor, he started the car, which produced a plume of white smoke. When the smoke cleared, he cleared the code and never seen it again. I did the same and it worked but after driving a week and a half continuously and oil change, the P code came on.
Fuel injector failure, replaced injectors, upstream and downstream sensors now throwing p catalyst below threshold.
Is it likely that the failing injectors resulted in this? Any suggestions on how to proceed with diagnosis? You might be able to salvage it with an Italian Tune-Up drive it like you stole it. Make sure to check for other things skewing the oxygen content of the exhaust stream, though, like defective exhaust gaskets, rusted-out flex pipe, or rusted seams.
Counterintuitively, each puff is followed by suction, because of the way exhaust pulses in the exhaust. Congrats on pushing your Camry past the typical service life! Judging by the age and mileage, P could be caused by an exhaust leak, lazy post-cat oxygen sensor, or spent cat.
Hej, I trying to solve the problem for aygo, km, first time I got motor lamp shine, and it was Code P B1S1, after one week this code dissappear and it comes p, and finnaly after 2 weeks I get P permanent code I erase that and change spark plugs because it was looking very bad, so we drive like 2 weeks without any problems but now code come back again, I erase it again so i dont know when the code comes back again, car is using basically just in city driving, so maybe I can get some tips?
I check O2 sensors and cables , heater resistans too, intake leaks, exhaust leaks, everything was looking good so I hope so to get some advice? A week in a half ago, I had the P code only. I watched a YouTube video where a mechanic had the same code on his vehicle. In short, he removed the upstream 02 sensor, while the exhaust system was fairly warm, and sprayed sea foam into the bung hole of the 02 sensor. He let it sit a good hour or so after he reinstalled the 02 sensor. After the vehicle sat for an hour, he started the car and a huge cloud of white smoke came out until it cleared.
He commented that this procedure has help many of his clients… So I gave it a try, following the procedure. I noticed that the p code had not illuminated in over a week and a half of daily driving Uber. I went to get an oil change and in about a couple of hours, the CEL came on p I stopped driving it, bought a Bluetooth scan device and found out some readings relating to the bank 1 02 sensor 1.
I changed my cat with a bosal unit. Changed both 02 sensors and still have the p code plus misfire 1,2,3,4. Runs fine for like 20 miles and then all hell breaks lose! Plugs are new.
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