The examine engine light / engine administration light on my Honda CR-V came on recently. Then it went off…then the came ago on again…then it went off again. You deserve to probably assumption: v what occurred next. In this post I’m going to describe how I resolved what was resulting in the light to it is in on, what had actually gone wrong (knock sensor) and how I solved it (replaced the sensor).

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The automobile in question below is a 2004 Honda CR-V v the 2 litre K20A petrol engine. This engine is uncovered in numerous other Hondas (Accord, Civic, stream Stepwgn), so hope this information will be helpful for several people.

Obvious and less obvious clues something to be wrong

Clearly the obvious clue was once the engine administration light came on. Now I’ve resolved it, ns realise the Honda had actually been giving me subtle hints that something wasn’t appropriate for some time before the light come on. It wasn’t driving rather as the should, but additionally wasn’t quite poor enough or annoying sufficient to make me notice. Having fixed the problem, I currently appreciate there was a slight hesitation when starting to accelerate from idle.

Finding the cause

When the light an initial came top top I stopped as quickly as I might to check for obvious signs (or smells) of woe under the bonnet and also under the car. I suggest you carry out the same if this wake up to you. In mine case, everything was fine.

At this allude I knew I required to reach because that a code reader. I provided a Foxwell NT200 diagnostic scan tool.


This is a very cost reliable unit however there space a pair of things to be mindful of:

It have the right to only deal with ECU password (i.e. Not airbag, ABS or other electronic modules).It doesn’t execute JOBD, therefore isn’t suitable for use on Japanese income cars. JOBD is a variation of OBD2 because that cars marketed in Japan. Check before buying a code reader if you want to usage it on an imported car!

Neither the these things were appropriate in this situation.

If you haven’t supplied one of these code readers before, the is really simple:

Plug in the reader.Switch top top the ignition.The password reader gets strength from the car, so doesn’t need its very own power.The code reader will connect with the car’s ECU and also report back on whether any kind of codes room stored. The isn’t fully automatic for this reason you’ll need to click through a couple of menus. This reader only has 2 buttons so friend can’t walk too far wrong.

I to be hoping to check out a single code present up ~ above the display screen rather 보다 a grasp of codes, which deserve to be more challenging to diagnose. Thankfully i was ‘rewarded’ v a single code – P0325, which refers to a fault with the knock sensor.

What is a knock sensor?

We should more than likely start by covering ‘knock’ itself. The is likewise known as pinking and also refers to the noise created when the wait fuel mixture in the cylinder ignites at the not correct time (i.e. No in an answer to the spark from the spark plug).

If this keeps happening it have the right to be poor news for her engine.

This is why engines have actually a punch sensor. This is bolted come the engine block and basically listens the end for knocking. Once detected, the ECU adjusts the ignition time or air fuel ratio to avoid the knocking.

Fixing Honda P0325 code – replacing the hit Sensor

Start by putting the automobile on some ramps so friend can get underneath. A jack and axle stands will certainly be well too, but I find ramps faster for jobs where i don’t have to take the wheel off.Check the wiring and the present knock sensor are secure, so girlfriend don’t rubbish money top top a new sensor if there is a easier solution. In mine case, they were, for this reason on to the next step……which was to research the likelihood of a fault with one more component resulting in this Honda P0325 code. This is the second component of ‘trying not to rubbish money purchase unnecessary sensors.’ i didn’t uncover a an excellent deal of info to suggest this, so set about sourcing a replacement.

Time was not on my side – i was walk on vacation in 2 days so no really have time to order online and also wait for delivery. So i contacted my neighborhood Honda dealer and was surprised to hear they had actually one in stock. This confirmed that faults with this punch sensor are common: they wouldn’t save one in stock uneven they offered / replaced fairly a few. Us won’t talk around how lot it cost!


On to the replacement procedure. The instructions can be summarised as follows:

Disconnect wire.Undo old hit sensor.Screw in new knock sensor.Reconnect wire.

Fairly straightforward then? Yes and also no, depending upon your patience, dexterity and also the size of your hands. Let’s go with the procedure because that Honda punch sensor replacement.

Disconnect the battery an adverse terminal.Make you yourself a coffee / tea / drink of your choice.Use hands or angled lengthy nose pliers to release the wiring connector indigenous the sensor and also remove it. Ns did this little with my hand, but this is tricky since you can’t check out what you’re doing!Make sure the sensor mating surface ar on the engine block is clean and also flat (i.e. Remove any grease and also rust).Screw the new sensor right into position by hand.Tighten the brand-new sensor to 31 Nm.Reconnect the wire to the sensor, making certain the connector clicks into place.Reconnect the battery.

At this point you deserve to start the engine and also (hopefully) reap the absence of engine administration light on her dashboard. I associated my fault password reader before starting, totally expecting to have to delete the P0325 code, but it had currently gone. This was a great result. Time to placed the undertray ago on and go for a check drive.

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Honda P0325 code Summary

We’ve currently been through exactly how to recognize the Honda P0325 password as a reason of the engine management light coming on. We’ve looked at just how to deal with the problem by replacing the punch sensor, using the renowned K20A engine in a 2004 Honda CR-V together an example. I uncovered this a an extremely satisfying fix. As well as getting rid that the engine management light, and any concerns about engine damage, that actually improved the driving suffer too. Over there may have been a marginal innovation in fuel consumption, yet it is complicated to speak for certain because addressing this problem synchronized with warmer weather.

I hope this info was beneficial for you. If noþeles wasn’t clear or if you’ve got a question, why not post a comment below?