Need Help?

1995 Infiniti G20 Base 4dr Sedan Luxury Sports 5-Spd

1995 Infiniti G20
Do you own this car?
Estimated Mileage
Enter current mileage for most
accurate info about this vehicle

Track Your Service Records
Get Recall Alerts
Get Updated Value Estimates on Your Car.

back to question list

Ask the Community

Ask Our Auto Mechanics

February 17, 2011, 11:56 am


Question: Need help with OBDII Codes and Cost Range to Fix

PO 325 Knock Sensor

PO 505 Idle Air Control

O2 Sensor's Replaced front and rear.

Is the Knock Sensor replacement an easy fix?

Also the Idle Air Control....?? Easy?

I would appreciate instructions if they are easy fix's

February 20, 2011, 9:25 am

Tyler O

New knock sensor is listed at $190, labor time is 1.8 hours to replace.

I would clear the codes first and see what comes back.

The idle control motor might just be a loose connection if it's idling fine. They can also sometimes just be removed and cleaned up rather than replaced.

1/1 users found this helpful.

February 20, 2011, 11:49 am


yea thanks a lot but if worse circumstance how much could the idle control motor cost me with labor? The idle control is out of whack cause I have to pump the accelerator while starting. Like as I turn the key I have to give it some gas then let off. The rpms go up and down. Thanks

0/0 users found this helpful.

February 20, 2011, 12:54 pm


but after 30 seconds running the idle goes back to normal and I don't have any problems. It runs smooth once warmed up.

0/0 users found this helpful.

February 21, 2011, 10:05 am

Tyler O

You need to do an intake leak test. You might have some vacuum leaks causing the idle issue. Once you are SURE that you have no intake leaks, then I would think about replacing the idle air control motor.

Most shops use a smoke machine that can push smoke and pressure into the intake to easily find even the smallest leak.

If you really need the idle air control motor, expect to pay $300+ for a new one. Maybe try a junkyard part first.

1/1 users found this helpful.

February 21, 2011, 10:08 am


thanks that could be the problem cause i have a ram air intake installed

0/0 users found this helpful.

1 2 
Ask our panel of certified auto mechanics a question. We pay for their advice so you don't have to

My Auto Score

See the free AutoCheck score

Meet The Experts
Kim Perrin
Kim Perrin is our resident mechanic here at DriverSide. Kim worked as…
Tyler Orr
Tyler Orr is an expert in German and Japanese cars and has been a mechanic …
Elizabeth Kriesten
Elizabeth Kriesten worked as an automotive technician for several years at Dodge…
Tips on Servicing

Car Brakes: How Do You Know When to Change Them?

By Zach Bowman For those who suffer a daily commute through heavy traffic, your vehicle's braking system can bring thousands of pounds of metal, plastic and empty Starbucks cups to a stop hundreds of times before you get to work. It goes without saying that these pieces wear out, but they do so slowly, meaning you may not notice they need attention until ...

Read more…