Q: Q: Can't pass smog check.

asked by on

My Check Engine light went on and off today. When I took it for a smog check, it showed a code P0325, Knock Sensor I CKT Malfunction.

Hello. I am glad that you got the codes from the smog shop as that helps with the diagnosis. I have changed a lot of knock sensors on this model of Subaru when this code comes up. I have also seen the connector fracture and cause the terminals to have poor connections which will also turn up this code. A certified mechanic will do a resistance test of the sensor and also do a visual of the connector to diagnose this. You should enlist the help of a certified mechanic, like one from YourMechanic, who has the tools and the experience to be able to perform this task.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Q: Can't pass smog check.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: the lower control arm bushings split cracked and loose

The components on the lower arm are vended separately so you can refurbish an existing arm or you can buy a pre-assembled complete control arm (arm, bushings, and ball joint all installed). The pre-assembled left and right control arms, as...

Q: What is the major problem in my car

Hello. When you have this many codes you either have an issue with the voltage system in the vehicle being low due to a bad connection, a battery that is failing, or a faulty alternator. It can also be...

Q: Getting codes P0161 and P0325

Hello. Both codes indicate a circuit failure, and I suspect that the connectors were not properly reconnected after changing the valve cover gasket. These codes are not likely actual part failures. It is a very tight squeeze to get in...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...