Auto Repair - Roadshow forum


Kia Rio 05 knock sensor electrical

Hey guys,

So I've been having a p0325 error code for quite a while so I'll bring you up to speed.

Upon research, the 01-05 Rio has bad grounding, so I double checked all the grounds were cleaned and resistances are adequately low. Still got the error code.
I found that one of the 3 wires for the knock sensor were damaged in the wiring harness were damaged, so I fixed that issue. That wire now seems fine from knock sensor wires - pcm.
Now I think another of the knock sensor wires have a resistance that ends up to 1 ohm, so obviously something isn't right. When I unplug the harness connector and check the resistances at either end, everything seems fine. When I plug the connector back in the circuit seems closed with low resistance. Call me crazy, but it seems that over a half hour or so I think the resistance slowly climbs a tenth of an ohm.

The car drives fine for a bit after replugging in the connector, but eventually it codes again and I notice slight drivability issues.

What would cause the resistance to slowly climb like this, if it happens? I've used dielectric grease on the connector to no avail.

If you need clarification on something I said that might be not clear I'll explain!

Discussion is locked
You are posting a reply to: Kia Rio 05 knock sensor electrical
The posting of advertisements, profanity, or personal attacks is prohibited. Please refer to our CNET Forums policies for details. All submitted content is subject to our Terms of Use.
Track this discussion and email me when there are updates

If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem. Also please exercise your best judgment when posting in the forums--revealing personal information such as your e-mail address, telephone number, and address is not recommended.

You are reporting the following post: Kia Rio 05 knock sensor electrical
This post has been flagged and will be reviewed by our staff. Thank you for helping us maintain CNET's great community.
Sorry, there was a problem flagging this post. Please try again now or at a later time.
If you believe this post is offensive or violates the CNET Forums' Usage policies, you can report it below (this will not automatically remove the post). Once reported, our moderators will be notified and the post will be reviewed.

All Answers

Collapse -
There used to be a spray you used on contacts.

In reply to: Kia Rio 05 knock sensor electrical

One for cleaning and one for corrosion control. It's been years so what we used is not in my memory but check your auto parts shelves for this. Worst case is you have to replace the harness or connectors.

Collapse -
Knock sensor

In reply to: Kia Rio 05 knock sensor electrical

Hi, Mike; Resistance values will change with temperature. It is very possible that the knock sensor is faulty, or, it's picking up a noise (thinking it's hearing a knock) and retarding the timing.
Good luck.

Popular Forums

Computer Newbies 10,686 discussions
Computer Help 54,365 discussions
Laptops 21,181 discussions
Networking & Wireless 16,313 discussions
Phones 17,137 discussions
Security 31,287 discussions
TVs & Home Theaters 22,101 discussions
Windows 7 8,164 discussions
Windows 10 2,657 discussions


Sublime suburban chariot

High on style and technology, the 2019 Volvo XC90 is an incredibly satisfying everyday crossover.