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Code PO325

Tiny
PATTYBOY
  • MEMBER
  • 2003 KIA RIO
  • 1.6L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 9 MILES
I have had issues with acceleration going up hills' no power no obvious downshift of transmission- just flat. I am taking the car to a mechanic; I don't know much but I will have the timing checked. The belt was replaced at 50,000 miles, I am also replacing the throttle position sensor, idle air intake valve, as well as the MAP sensor and air intake temperature sensors, also the knock sensor; the labor rate is $130.00 an hour. Just please tell me what you think. These sensors have never been replaced; I will replace the (2) oxygen sensors myself. The scan called for PO325 knock sensor. Also the mass airflow sensor was just replaced. Thanks, PATTYBOY
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Wednesday, November 3rd, 2021 AT 10:35 AM

4 Replies

Tiny
AL514
  • MECHANIC
  • 4,632 POSTS
Hello, is there a reason why you're replacing all those parts? I can see doing the knock sensor, but all those additional parts at $130.00 an hour will be costly. How many miles are on this vehicle? With a real lack of power like that and no other codes, you might want to check the Catalytic Converter. A clogged-up converter will cause those symptoms, if you're not getting any misfire codes or any codes that relate to those sensors, you should check the converter first. Because if it's bad it will cost more than all those parts combined. You can do a back pressure test right at the hole where the front Oxygen sensor lives. Thats where I would recommend starting.

https://www.2carpros.com/articles/bad-catalytic-converter-symptoms

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter
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Wednesday, November 3rd, 2021 AT 2:36 PM
Tiny
PATTYBOY
  • MEMBER
  • 6 POSTS
My rationale is to replace as many fuel/air/sensors as possible; I will ask the mechanic to check the catalytic converter; replace the knock sensor- that's the only code showing-key on. Car running! Thank you for the information and recommendations. I will rethink my approach to this issue. Thanks again, PATTYBOY
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Wednesday, November 3rd, 2021 AT 4:03 PM
Tiny
AL514
  • MECHANIC
  • 4,632 POSTS
Glad to help, doing the oxygen sensors at high mileage is not a bad idea, because they do slow down with age, the Mass Air Flow can be cleaned because that usually only gets a little carbon build up on the hot wire sensor that you can see looking into the air intake tube. But most other sensors will last, most of the time it's a wire that will be affected first due to engine vibrations and the elements. The Converter should be no more than 1-1.5 PSI back pressure at the front oxygen sensor location just so you know. Hope it goes well for you.
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Wednesday, November 3rd, 2021 AT 5:48 PM
Tiny
PATTYBOY
  • MEMBER
  • 6 POSTS
Thank you very much for the recommendations and insights. My thinking is to replace the knock sensor-got a code PO325; check the catalytic converter-and replace the air intake valve; I will ask the mechanic to scan the entire system and see if any codes exist during a live data feed; wish me luck and thanks again. PATTYBOY
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Thursday, November 4th, 2021 AT 7:36 AM

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