P0305 is a fairly common problem code through the Mazda CX-9. It’s and also OBD2 code and also stands for:


P0305 is definitely a cause for concern, and also should be thought about a danger to the drivability your CX-9. The nice thing about P0305 is that it’s a cylinder details trouble code, which renders diagnosing the difficulties simpler than P0300, which method that the cylinders are randomly misfiring.

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It will often be accompanied by password P0301, P0302, P0303, P0304 etc…. These certain codes show that there is a misfire in cylinder’s one, two, and also three respectively.


Fixing P0305 must be thought about a high priority. Unequal a many the OBDII codes, this code has to do directly with engine combustion. It also can price money to disregard it, due to the fact that driving v a misfire can damages the vehicle’s catalytic converter. The engine is also not firing all of the fuel, so raw fuel is likewise passing with Cylinder 5 into the exhaust. Mileage may suffer as well when your CX-9 has actually P0305 together well.

Mazda CX-9 P0305 Definition

P0305 is a cylinder specific misfire code, which method that Cylinder 5 is misfiring and causing it. Vital thing to understand when detect the location of Cylinder 5 is that it’s going to it is in the fifth cylinder in the shooting order. The won’t be the 5th cylinder the you might see when looking at the engine.

CX-9 P0305 OBDII password Symptoms

The P0305 trouble password will cause the CX-9’s company engine shortly light. The automobile itself may start to operation rough. It depends on exactly how serious the misfire is. The car may create excess vibration, especially at lower RPM. Fuel mileage may suffer. You may smell life gas coming from the tailpipe. The vehicle may backfire.


P0305 Trouble code Diagnosis- Mazda CX-9

There are quite a couple of things the can reason the P0305 trouble password to cause the Mazda CX-9. Right here are the most typical problems that may reason it. They room presented rather in bespeak from most to least likely come be bring about the code:

Cam or Crank Sensors– This one is an extremely unlikely, however it walk happen. If the ECU is not acquiring the appropriate signal from these sensors, the vehicles time is no going to sync up and also it’ll misfire. Low Compression– If you have a leaking head gasket, bent valve, cracked head, etc.. That would cause compression to not be as high as it should, you’re going to acquire P0305. You should likewise feel the vehicle is under on strength as well.

Most common P0305 Fixes

If you monitor the items detailed above you should have the ability to fix the P0305. Here’s just how to go about it:

Inspect and also test the parts of the ignition system about the cylinder to determine whether or not you have to replace the coil packs, plugs, or wires. Most of the time among those three things will end up being the problem.

You must reset the trouble codes and also swap the coil pack, wire, and plug indigenous Cylinder 5 to one more cylinder. If you get a different P030X code, you’ll understand that among those three materials is bad, because by relocating those components you have changed which cylinder the trouble code has actually registered in. ~ that, go ahead and also replace them or have actually them tested. It’s an easy, and also cheap method of identify if your ignition materials have unable to do bad.

After that you would want to check the fuel injection system. There are links above that’ll present you exactly how to execute that. If the doesn’t work, it may be time to execute a compression test and see if you have actually a leak in the cylinder.

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Is P0305 a serious Concern?

P0305 is cause for concern and also left unfixed deserve to leave you stranded or do the auto virtually un-drivable. Solving the trouble causing the password to fire deserve to save girlfriend time and also money and also keep your Mazda CX-9 from breaking down. Quick action may additionally save her catalytic converter native going bad. An excellent luck diagnosing the issue. If over there is anything the you would favor to add please leave a comment below.