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Intermittent p0420 code

Intermittent P vs. Tags: catalytic converter oil burning p Thanks for all the great info on this forum concerning P My Prius with k miles is pitching an intermittent P alone.

It burns about 1 L of oil per 3k miles. Does anyone know the rate of catalytic converter clogging vs. I am not willing to invest in an engine rebuild to stop the oil consumption due to the age of the vehicle, so I'm trying to determine if putting a new converter in will buy me approximately 2 years. I'm in Georgia near Atlanta and have to pass yearly emissions inspections they do not perform an exhaust test but they do check for current and recent codes.

I am not interested in the trick method of spacing out the downstream O2 sensor. Thanks in advance for any advice you good people might lend.

Intermittent P0420 vs. oil consumption advice please

SFO Senior Member. Not sure how fast you drive, but many believe there is a correlation with oil consumption levels.

If you have a DIY attitude, you could try soaking the catalytic converter in citric and oxalic acids. It might buy you some time or miles. Otherwise wait until you're up for another inspection, then buy and install a direct fit cat for a couple hundred.

Subaru Outback P0420: Catalyst System Efficiency → Below Threshold → Bank 1

Personally found that replacing my heavily used spark plugs with new, and replacing the fuel injectors with reconditioned to be of some help in mitigating my intermittent P, but that only lasted about miles. Still the code is back, full time now. I'll do a cat soak before the next smog inspection, or just swap in a new cat if the soaking proves ineffective or doesn't last long enough to pass the smog.

Raytheeagle Senior Member. Skibob Senior Member. I wonder what it would do to the fuel bladder. Patrick Wongdbailey and Raytheeagle like this. I might email the companies to see if they know anything. Is there a crank bolt?

Is there any recommendation against doing this? Thanks everybody. Excellent advice - thank you very much. I'll post here when I finish up. Well I chickened out on the piston soak for fear of hydrolock. The plugs were fairly dark and sooty, and the PCV valve was gunky but still shaking a bit. I didn't have a torque wrench so I just made the plugs snug without overtightening I hope.

Anyway, I can tell a noticeable difference in the smoothness of the ICE, and it doesn't seem to clunk as dramatically when it shuts off as it was doing. I have not noticed any change in gas mileage I average in the low 40s but I don't baby it at all. I'll keep an eye on the oil consumption and if these maintenance items don't help, I'll pull the plugs and try the MMO soak.

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JPG File size: You must log in or sign up to post here. Show Ignored Content. Similar Threads - Intermittent P consumption.

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Replies: 0 Views: Replies: 7 Views: 2,Welcome to P The P code is a very popular one and that's why there's a site dedicated to that specific trouble code. If your car's check engine light is on, get that code read in case it's a P All vehicles from newer sold in North America support this generic powertrain code.

This code is a pretty common one and this site is here to help the average do-it-yourself DIY car owner like you troubleshoot, diagnose, and fix their vehicle themselves when presented with a P code, saving money.

If your car has multiple trouble codes DTC'sit's always a good idea to fix them in the order they come up on the code reader. For example, if you have these codes - P, P, P, then you're going to want to tackle the P Random Misfire code first resolve itand then tackle the P code, etc.

The reason for that is that the first code could be causing further DTCs to be set. If you've come to this site you most likely already know that you have a P code. Also, be sure to follow proper diagnostic procedures to determine whether a part has failed. If you simply change parts hoping it will solve the problem, you're really just guessing and wasting money. This site is here for information purposes only and is meant to help you learn more about the dtc and decide if you can tackle the repair yourself.

It is not intended as car repair advice. OK, now tell me that again in plain English please Bank 1 refers to the side of the engine which contains cylinder 1. FYI this code is identical to P however that code is for bank 2. You may even find you have both P and P trouble codes at the same time.

Great question! A P code will cause no symptoms aside from the MIL malfunction indicator light will illuminate. The reality is there is still something wrong and your car needs attention in order to be in excellent running condition. A poorly maintained car will run less efficiently, burn more gas, and cost you more money in the long run.

Plus, if your check engine light is on for a P code and you decide not to fix it, another more serious code could be triggered and you'd never know. The MIL lights up whether you have one code or ten! While I have your attention, don't forget to do oil changes as the owner's manual schedules and keep those tires inflated to the proper PSI.

There are a number of things that could be causing this p catalyst efficiency code. The most common thing is the catalytic converter itself is no longer functioning properly. The other likely thing is the rear O2 oxygen sensor is no longer working properly. The easiest thing to do first is a visual check of things. Visually inspect the exhaust system for leaks, check the catalytic converter for dents, holes, severe discoloration, and check for a rattle inside.

If any of those symptoms are there, the converter likely needs replacement. Then, visually inspect the downstream O2 sensor behind the converter.

Check for broken wires, obvious faults, etc.Visually inspect the related wiring harness and connectors.

intermittent p0420 code

Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins. Replacing the oxygen O2 sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P code is combined with other codes, try fixing the other codes first.

What does this mean? The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type.

A three way catalyst converter Manifold with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2. As oxygen storage capacity decreases, the heated oxygen sensor 2 switching frequency will increase.

When the frequency ratio of heated oxygen sensors 1 and 2 approaches a specified limit value, the three way catalyst malfunction is diagnosed. Get Access to Factory Service Manuals.

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Need more help? Get the P Toyota Echo code diagnosed by a professional: Find a repair shop in your area. Related Information. Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the P Toyota Echo code? Have you replaced any parts? Any information is appreciated. Repair Importance Level: 2.

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Posted and Edit by AutoCodes.One of the most common trouble codes with all Honda vehicles is the P Your CR-V has at least two oxygen sensors, one before and after the catalytic converter. Among the many jobs that oxygen sensors have is they have to measure the emissions levels coming in and out of the converter.

When the readings from the upstream and downstream oxygen sensors show similar readings, the vehicle will throw the service engine soon light P The P code in a Honda CR-V 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 CR-V. 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. Here are a couple of good guides to help with that. If there are any inaccuracies, or anything that you feel could improve the article, please feel free to comment or message.

intermittent p0420 code

Thank you. The software in your vehicle believes that the catalytic converter is no longer doing its job. Here are the typical symptoms that something is wrong when you have code P Mileage- May or may not suffer depending on how much the catalytic converter is clogged. Loss of Power — It is a really strange feeling to drive a vehicle with a catalytic converter that is going out. Oxygen Sensor — The P codes is thrown when the oxygen sensors on both sides of the exhaust have very similar readings.

When the oxygen sensor is bad, it can cause a false reading and trigger the code. Over time, they can become clogged.

P0420 FORD - Catalyst System Efficiency Below Threshold Bank 1

Although, modern catalytic converters are supposed to last the life of most vehicles, it could be there is some underlying problem if it has clogged. O2 Sensor Wiring — Over time, the oxygen sensor wiring can go bad. It is especially volatile since it is right next to the hot exhaust at all times.

The downstream oxygen sensor wiring is especially volatile since it is so far from the ECM more distance to travel. CR-V Timing — If your CR-V is misfiring or the exhaust timing is off, this can affect the gasses that are actually going to the O2 sensors enough to cause the P code to register. When the fuel mixture is rich, the exhaust the O2 sensors see will be out of range and it could throw the sensor.This page is meant to help you troubleshoot the Subaru Outback P trouble code.

It covers Subaru Outback P meaning, symptoms, causes, and possible solutions. Jumping straight to replacing the O2 sensor can cost you time and money.

P is a very common trouble code. Your Outback has at least two oxygen sensors, one before and after the catalytic converter. Among the many jobs that oxygen sensors have is they have to measure the emissions levels coming in and out of the converter. When the readings from the upstream and downstream oxygen sensors show similar readings, the vehicle will throw the service engine soon light P When the numbers match, the software in your Outback believes that the catalytic converter is no longer doing its job.

The P code in a Subaru Outback 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. Related: P Subaru Outback. There are many things that can cause the P trouble code in your Outback. 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. Here are a couple of good guides to help with that. Good luck figuring out what is causing P with your Subaru Outback. If there are any inaccuracies, or anything that you feel could improve the article, please feel free to comment or message. Thank you. The code technically stands for: Catalyst System Efficiency Below Threshold Your Outback has at least two oxygen sensors, one before and after the catalytic converter.

Here are the typical symptoms that something is wrong when you have code P Fuel Efficiency- May or may not suffer depending on how much the catalytic converter is clogged. Loss of Power — It is a really strange feeling to drive a vehicle with a catalytic converter that is going out. Oxygen Sensor — The P codes is thrown when the oxygen sensors on both sides of the exhaust have very similar readings. When the oxygen sensor is bad, it can cause a false reading and trigger the code.

Over time, they can become clogged. Although, modern catalytic converters are supposed to last the life of most vehicles, it could be there is some underlying problem if it has clogged. O2 Sensor Wiring — Over time, the oxygen sensor wiring can go bad. It is especially volatile since it is right next to the hot exhaust at all times.

Outback Timing — If your Outback is misfiring or the exhaust timing is off, this can affect the gasses that are actually going to the O2 sensors enough to cause the P code to register.The P code is stored in memory when the ECU detects a low efficiency in the catalyst system for bank number 1 the bank of cylinders where cylinder number 1 is located.

The ECU determines the efficiency of the catalytic converter CAT using two sensors: the upstream oxygen sensor, located before the CAT, and the downstream oxygen sensor located after the catalytic converter. The Oxygen sensors are located near the catalytic converter.

P0420 P0430 Catalyst Efficiency Below Threshold - Testing & Verification

To calculate the catalyst efficiency, the ECU compares the values of both oxygen sensors in real-time. When the values of both sensors are similar the ECU infers a low efficiency in the catalyst system.

If you also have any other code related to the ignition system, emissions system or fuel system then you should start diagnosing them first. Depending on the catalytic converter installed on your vehicle, you may need one or more of the following tools:.

Always refer to the appropriate OEM literature when possible. Original manufacturer diagnostic procedures should always have precedence over a generic workflow. In case the Check Engine Light stays off then you may have an intermittent problem. If the light lit during your driving cycle then continue with the diagnostic process. Any sign of exhaust leaks, overheating or excessive corrosion may be an indication of replacement.

Look for burnt, damaged, corroded or deteriorated wires, also unplug each sensor and look for bent terminal pins, loosely connections, corrosion or any other possible indication of a bad connection. Start your engine and allow it to reach its normal temperature. Watch the upstream and downstream oxygen sensor values for bank 1. If both readings are too similar you can assert the CAT is faulty.

If your scan tool has a graphing ability turn it on. Graph engine RPM and O2 sensor output simultaneously. Accelerate the engine to RPM. You should see the voltage varying during acceleration and then stabilize. Decelerate to idle. You should see the opposite variation in the O2 output. Repeat the procedure several times. Some manufacturers include special tests for the O2 sensors.

Follow on-screen instructions to complete those tests. Please notice that oxygen sensor output is completely different between wideband models and narrowband models, refer to the appropriate OEM literature to determine their expected behavior. Graph engine RPM and O2 output simultaneously. You should see the voltage fairly stable. Now allow the engine to return to idle. You should not see much variation in the O2 output. If the downstream O2 sensor output closely resembles the upstream oxygen sensor output then you may have a bad catalytic converter.

On most late model vehicles, the ECU does an excellent job diagnosing the catalyst system. This article will assume this is the case and your CAT needs replacement.

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For detailed instructions on how to replace your oxygen sensors refer to our faulty oxygen sensor write up. The catalytic converter is located in the exhaust pipe just after the upstream oxygen sensor, and it resembles a standard muffler.

The catalytic converter is usually located near the engine end of the exhaust. Detaching the negative terminal is usually enough.Remember Me? Page 1 of 3 1 2 3 Last Jump to page: Results 1 to 10 of Thread: A8 4. Thread Tools Show Printable Version. After I got the first time, I did the Mr. Gasket Cataclean treatment to start with the easy stuff, did not help. The car runs great. Se here's the fault code, no other DTCs present.

Last edited by Uwe; at PM.

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Originally Posted by jal3. So I've gotten this code twice in about two weeks now, wonder if anyone has had any experience or has any ideas on what could be going on. Cat going bad? If anyone has any idea on where to start, that'd be most awesome. Also if there's any more info needed, please let me know and I'll add it here. Reason: Snipped quote. Ja ja please post an auto-scan. In Conjunction with Autoscan added Autoscan as requested: Code:.

Uwejal3 liked this post. Don't know about the FW update, gotta talk to the stealer, I guess.

intermittent p0420 code

Last edited by jal3; at AM. Please follow aforementioned instructions first, then we commence evap Sure thing, I'll be back once the P comes up again.

Fredrick Awuor liked this post. Yes, that's what I meant. Doesn't really make sense doing the scan before the fault happens again, right? Page 1 of 3 1 2 3 Last Jump to page:.


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