There is a knocking under my 03 Navigator whenever I am idle. Very irratating and almost embarrassing when at a light or stop sign. what is this...the ball joint, muffler, exhaust, what? ...I need advise before going to the dealership and always feeling like I'm getting ripped off.

The air bags are leaking, replace them as a pair.

P0325 - Knock Sensor Circuit Malfunction
Possible causes- Faulty knock sensor
- Knock sensor circuit short to ground
- Knock sensor circuit short to power
- Knock sensor circuit open
- Faulty Engine Control Module (very unlikely).
P0139 - O2 Sensor Circuit Slow Response Bank 1 Sensor 2

Possible causes- Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Faulty Rear Heated Oxygen Sensor Bank 1
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks

IF YOU SEE CHECK ENGINE LIGHT FLASHING. CODE SCAN COULD HAVE FAULTY TCC SOLENOID CAUSING TORQUE CONVERTER TO REMAIN LOCK UP.OR YOU COULD HAVE BAD IDLE AIR SPEED CONTROL.INTAKE LEAK EGR SOLENOID STICKING OPEN. COULD HAVE BAD PLUGS AND WIRES.BAD FUEL INJECTOR.CLOGGED FUEL FILTER.WATER IN GAS FUEL CONTAMINATED.

You've replaced too much. You could have a cracked coil. Start it up in the dark and watch for sparks under the hood.

Check the wheels and see if the drums are not tight. and also the erratic Idling Could be from your Torque converter Clutch Solenoid that doesn't work properly and if the Solenoid gets totally bad then your car will be stalling.all Well i can say is Check your transmission fluid level and your brakes. Good luck

more than likely you have a vacuum leak
get some carb cleaner
start car and let idle
spray carb cleaner around intake gaskets throttle body vacuum lines etc
if you notice a change in idle (revs up or stumbles) repair that part

I had the same problem, you can replace both the acc band and the band tensor, the vibration comes from a loose band.

i had the same trouble, there is a rubber boot under the cover on the top of the motor, it is coming from the egr valve, takes about 5 mins to repair and less than 5 dollars.

Sounds like a transmission problem. Possible torque converter clutch issue,means replace the transmission.

My rio kia bought on from uyi technical dealer in benin city, edo state of nigeria only 4 months ago is vibrating with noise while driving. The noise is noticed by other road users even in motion, making a very loud noise or sound that is highly embarrassing. The dealer mechanics have checked more than twice yet no result, instead the hub bearing is observed; tyres are turn over yet the noise persists.

What do think is resolution to the problem? pls help me. Vinson- [email protected]