Q: I'm ready to buy a 2004 Chevy Silverado but chk engine light shows Knock Sensor. Also Oil Pan Leak, Fr Axle Seals Leak. Buy? Cost?

asked by on

I'm looking at buying a 2004 Chevy Silverado 1500 extended cab Z71 with 126,000 miles, but during test drive, the check engine light came on. The computer shows the code of P0332 - knock sensor 2 circuit low input (bank 2). Also, my mechanic said it shows signs of an Oil Pan Leak. And he also said the Front Axle Seals are Leaking. I've gotten the price down to $11,200 but they don't want to do anything more to it including diagnosing and fixing the knock sensor issue. Would you still consider purchasing this truck and if so, what kind of costs am I looking at to fix the 3 issues I mentioned. Also, is the knock sensor thing a pre-cursor to more problems down the road with the engine or is this a common problem and nothing too serious? Thanks, Mike

My car has 126000 miles.
My car has an automatic transmission.

Hello Mike. You have found yourself in a position where there is a lot to consider, and the choice is going to come down to how much risk you are willing to take with this truck. Starting with the knock sensor, it can be anything from a bad connection to a bad knock sensor itself. If the engine seems to be running quietly and smoothly, it is likely a connection or sensor problem. The oil pan leak is also a problem, because of how difficult they are to fix (even if it is just the gasket). Often you have to remove several components and possibly even raise the engine to get access to it. When you add the axle seals into the mix, you have to consider the time, effort, and money it takes to replace them as well. If the truck is in great condition otherwise, you may have a decent purchase. However, axle seals, oil pan gaskets, and knock sensor issues all happen with heavy wear typically, and the truck may be closer to the end of its life than it seems. 126,000 miles is not a lot, and if you can get the repairs done relatively inexpensively, then you may be taking less of a risk. For a second opinion and inspection, contact our service department to schedule an appointment.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. I'm ready to buy a 2004 Chevy Silverado but chk engine light shows Knock Sensor. Also Oil Pan Leak, Fr Axle Seals Leak. Buy? Cost?

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: My car is losing oil.

The first thing to have checked is if the engine has any oil leaks that could be the cause of the oil loss. The most likely problem is that the engine oil is being consumed in the engine and going...

Q: When I put my feet on gas pedal it won't go fast no more then 30

Check to see if any diagnostic trouble codes have been stored and use a real time scanner to check the response of the throttle position sensor and oxygen sensors. The throttle position sensor sends a reference voltage to your power-train...

Q: Brake lights not working in a 2003 Chevrolet Silverado 1500

The first thing to check for is any blown fuses for the brake lights. The brake light switch gets power from the a fuse and then sends power into the brake light fuse and the turn signal module. Power from...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...