Q: Q: Check engine light

asked by on

Just had car in for service, had oil gasket leak repaired as well as a O2 sensor. On the way home check engine light comes on again.

Get home and pull out the OBD code reader and stored code is reading P0325 - Knock Sensor 1 Circuit Bank 1 or Single Sensor. Pending Codes: P2187 - System Too Lean at Idle Bank 1, as well as the above mentioned code.

Could these codes be related to the above repair work done? Any other advice on these codes is appreciated.

My car has 93500 miles.
My car has an automatic transmission.

Although, there is no definitive way to say those are related, it is quite possibly and likely that they may be related. When the O2 sensor is not working properly, it may cause the system to lean out due to incorrect inputs relayed to the computer causing it to create a lean fuel condition. This may also cause the knock sensor code as a result of the lean fuel condition. A lean fuel condition can cause what is known as "detonation" (also called "spark knock") which is an erratic form of combustion that can cause head gasket failure as well as other engine damage. Detonation occurs when excessive heat and pressure in the combustion chamber cause the air/fuel mixture to ignite on it’s own. This happens when there is not enough fuel to cool the air/fuel charge. I would suggest having a professional from YourMechanic come to your location to diagnose and inspect your vehicle.

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: Check engine light

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: Mitsubishi Endeavor overheating. Got waterpump and belt replaced less than a year ago what could it be

This may very well be a bad thermostat as this is often a common culprit of many overheating issues on most cars. The thermostat regulates the coolant flow in and out of your car's engine. When this is stuck open...

Q: How is the ESC manually turned off? Could I have done this by accident?

If the ESC light is on and you press the ESC button again and the light goes out then the button may have been inadvertently pressed and system turned off. If this happens then just press the button again to...

Q: Q: Transmission fluid leak

If transmission fluid is leaking, I would recommend having the vehicle looked at by a professional technician, such as one from YourMechanic. Often times, the vehicle's transmission pan gasket has sprung a leak, and this is a minor repair for...

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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...