Skip the auto shop - Our mechanics make house calls

Q: What does trouble code P0325 mean?

asked by on

My code says knock sensor 1 "b1 circuit." What does that mean? Is it worth fixing?

Scott

My car has 171000 miles.
My car has an automatic transmission.

A: Hi there - P0325 is a Knock Sensor Malfunct...

Hi there - P0325 is a Knock Sensor Malfunction. Knock sensors provide a significant function in a modern engine. A failure of the engine knock sensor is a somewhat risky issue. Modern engine have fairly high compression ratios, all in the name of maximizing fuel efficiency and power. This makes for high cylinder pressure during combustion, and makes the engine more likely to experience "pre-detention" or knocking. The knock sensor is critical in detecting this, and retarding engine timing to avoid this destructive issue. If it is essential to drive a few days with this problem, take care to keep your foot out of the gas as much as possible. Yes, it absolutely needs to be repaired to avoid engine damage, and improve efficiency. I would replace the knock sensor as soon as possible. Unfortunately, this is not a service YourMechanic offers at this point in time. Thanks for thinking of us!

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 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!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: My car is using much more oil than normal - 2004 Nissan Altima

Hello. The head cover gasket will not cause this. If it is giving a cloud of smoke when the vehicle is started, then it does have a valve stem seal issue. When the vehicle sits, the oil will enter the...

Q: Headlights wouldn't turn off / now they won't turn on

The most likely components to cause this may be the headlight relay, headlight switch, or the ignition switch itself. The relay is an electro-mechanical switch. The headlight switch sends a power signal to it. It then switches on internally to...

Q: A lot of oil is leaking out of the oil filter. It just pours out.

Hello. If oil is leaking from your oil filter, then either the filter is not being installed correctly or the oil filter housing is damaged. Most oil filters use a rubber gasket to seal the oil in the engine. If...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.