This web page is supposed to help you troubleshoot the Nissan Maxima P0420 problem code. That covers Nissan Maxima P0420 meaning, symptoms, causes, and feasible solutions. V the Maxima, OBDII P0420 is often caused through a poor oxygen sensor, but there can be other causes as well. Jumping directly to instead of the O2 sensor can cost you time and money.

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P0420 is a an extremely common trouble code. This password number recommendations a number the is offered to you when you plug your Nissan Maxima into a OBDII scanner. That doesn’t matter which version you have, this OBDII code has the same meaning for all of them (1996+)

Nissan Maxima P0420 OBDII password Defined


P0420 is a OBDII trouble code. The password technically stand for:

Catalyst system Efficiency listed below Threshold

Your Maxima has at least two oxygen sensors, one before and also after the catalytic converter. Amongst the numerous jobs the oxygen sensors have actually is they need to measure the emissions levels comes in and out that the converter.

When the readings from the upstream and also downstream oxygen sensors show comparable readings, the automobile will litter the organization engine quickly light (P0420).

These readings do not do it match, because the catalytic converter is claimed to it is in scrubbing the exhaust. Once the number match, the software program in her Maxima believes the the catalytic converter is no longer doing that is job.

Nissan Maxima P0420 password Symptoms


The P0420 password in a Nissan Maxima will often be thrown among your oxygen sensors space not functioning properly. Typically, the code will be prompted by the upstream oxygen sensor (before the converter).

There aren’t usually any type of drivability issues connected with P0420. For most human being the an initial sign the anything is dorn at every is the business engine soon light comes on.

Here are the usual symptoms that something is wrong when you have code P0420.

Fuel Efficiency- might or may not suffer depending on how much the catalytic converter is clogged. Service Engine Light– Often, this is the only symptom of the Nissan Maxima P0420 code.

Related: P0442 Nissan Maxima

Top reasons of P0420 in the Nissan Maxima

There are countless things that can reason the P0420 trouble password in your Maxima. Right here are the most typical ones.

Oxygen Sensor– The P0420 password is thrown when the oxygen sensors ~ above both political parties of the exhaust have actually very comparable readings. As soon as the oxygen sensor is bad, the can cause a false reading and trigger the code. If the engine does no exhibit any type of of the reduced performance linked with a bad catalytic converter, it really well might be the oxygen sensor (if you haven’t i found it the power loss yet). Catalytic Converter– A catalytic converter is responsible because that scrubbing the end as much pollution as possible from the Maxima’s exhaust. End time, castle can end up being clogged. Although, modern-day catalytic converters are an alleged to last the life of most vehicles, it can be there is some underlying problem if it has clogged. O2 Sensor Wiring– end time, the oxygen sensor wiring deserve to go bad. That is specifically volatile because it is right beside the warm exhaust at all times. The downstream oxygen sensor wiring is also volatile because it is so much from the ECM (more street to travel = more area to fail). Maxima Timing– If your Maxima is misfiring or the exhaust timing is off, this can impact the gasses that are actually going come the O2 sensors sufficient to reason the P0420 code to register. Exhaust Leak– If there’s a noticeable exhaust leak coming from the car it can adjust what the O2 sensors register sufficient to litter the P0420 code. Engine Temp Sensor– If the computer system doesn’t understand what the engine temp is it’ll keep the fuel mixture rich. When the fuel mixture is rich, the exhaust the O2 sensors view will be the end of selection and it could throw the sensor.

Nissan Maxima P0420 Code feasible Solutions

Often, the oxygen sensor is the cause of P0420. Especially it’ll typically be the O2 sensor(s) top top the upstream side of the catalytic converter.

But, don’t it is in surprised if it’s not. It would be a good idea to check the exhaust for leaks first. You should have the ability to hear one exhaust leak conveniently underneath that the vehicle.

Unless you have actually an exhaust leak, you’ll more than likely need to test the O2 sensors and/or catalytic converters. Below are a pair of an excellent guides to help with that.

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Good luck figuring the end what is resulting in P0420 with your Nissan Maxima. If over there are any inaccuracies, or anything the you feel might improve the article, please feel totally free to comment or message. Thank you.