iFixit - Answers With Device "Mazda 3"

2004-2009 Mazda 3: Mazda 3 Check Engine Light P0126 & P0128

Fri, 19 Apr 2024 18:46:10 -0700

The two codes from the check engine light are: P0126 & P0128

Here is what I found according to my research:

P0126 is either replace coolant temperature sensor or replace the thermostat. According to my research, 99% of the people who had this code needed to replace the thermostat. Once that was replaced, 99% of the people said that the light turned off and that they noticed the car ran better than it did before. Some people said that the repair is about $100 (including the parts and labor) and that no one should pay over $200. People said that they were even able to replace it themselves (if you can get under the car). The thermostat part is LF7015170. I looked it up online from a Mazda parts dealer and it's about $45-$50 depending on which parts dealer you buy it from. I'm sure I could even find it on eBay for cheap too.

P0128 indicates that the computer is detecting that the engine is not reaching operating temperature within a reasonable time after startup. I am guessing that this relates to the issue with the thermostat, but I'm not 100% sure.

CAN ANYONE GIVE ME MORE ADVICE/INFORMATION AS TO WHAT I SHOULD DO? HOW MUCH IT WILL COST?

⟐ Commented April 19, 2024 at 18:46 MST

2004-2009 Mazda 3: Intermittent check engine light caused by error P0128

Sat, 14 Jan 2023 09:35:25 -0700

My 2004 Mazda 3's check engine light is coming on periodically. I hooked up a tester to it and it's error P0128. What does that mean?

⟐ Commented January 14, 2023 at 9:35 MST

2004-2009 Mazda 3: help ...tcmwiring plug 06 mazda3 2.3 tcml32e tcm K

Tue, 11 Nov 2025 01:18:49 -0700

please help i need the diagram for 06 mazda 3 2.3L TCM control plug wiring plug B1_1 redo on harness side of TCM female connector lost track of wiring location on plug for tcm pins 06 mazda 3 tcm k # l32e189e1b other# k6266 plug B1-1 possistion of were each color goes in pinout

⟐ Commented November 11, 2025 at 1:18 MST

2004-2009 Mazda 3: Repair of sunroof so it will close/open

Wed, 14 Jan 2026 11:36:22 -0700

My sunroof is stuck in the 85% close position. Pushing either the open/close switch you just hear a 'rattat-tat' sound and the sunroof remains in the same position for most of the time. Some times it does move half an inch either way but that's all. I need to get under the headliner and be able to see if there are any small bolts loose/missing and what the track assembly looks like. Can you help and by chance also provide me with an excerpt from the factory service manual?

Sure. I thought I included it. It's a 2006 Mazda 3 and is a 4dr. Can you also find info for removing a portion of the overhead headliner in order to be able to work on the sunroof motor and track assembly?

Thank you.

⟐ Commented January 14, 2026 at 11:36 MST

2004-2009 Mazda 3: Is the AC clutch on a 2008 Mazda Mazda 3 replaceable?

Fri, 07 Feb 2025 12:13:39 -0700

So my girlfriend has a Mazda 3 2.3 sport, about 3 months ago the ac suddenly stopped working after a road trip. That being said I'm a mechanic at a local shop but much to my dismay we sub contract our ac work. After countless hours of electrical testing pressure checking and tons of homework I found the ac clutch was seized. Does any one know if the clutch could be replaced in order to get the ac going again or is it a complete ac compressor job?

⟐ Answered February 07, 2025 at 12:13 MST

2009-2013 Mazda 3: D/S window is not working!

Mon, 13 Jun 2016 17:54:06 -0700

I have a (2010) Mazda 3 sedan & my Driver Side window suddenly doesn't work , but the other 3 window works fine. I'm curious if it could be the motor or switch? How do you remove the switch panel as well? Thanks everyone!

⟐ Answer edited June 13, 2016 at 17:54 MST

2004-2009 Mazda 3: Why is my reverse light always on even when im not in reverse?

Sat, 23 Nov 2019 07:21:39 -0700

I have a 2006 mazda 3 GT with a manual transmission, and the reverse lights are always on even when im not in reverse. thanks for any help…

⟐ Answer edited November 23, 2019 at 7:21 MST

2004-2009 Mazda 3: 2004 Mazda 3 horn

Sun, 01 Mar 2015 19:54:48 -0700

2004 mazda 3 horn not working

⟐ Commented March 01, 2015 at 19:54 MST

2004-2009 Mazda 3: windshield washer reservoir is leaking

Wed, 06 Nov 2013 10:28:02 -0700

I have a 2007 Mazda 3 and the windshield washer reservoir has been damaged by hitting a curb. What is the easiest way to replace it? The bumper appears to be undamaged.

⟐ Edited November 06, 2013 at 10:28 MST

2004-2009 Mazda 3: sun roof won't close and makes a rattling noise

Sat, 10 Sep 2016 14:07:26 -0700

Sun Roof won't open at first I thought I was pressing the wrong button. I kept pressing each button until it opened. When I tried to close it; it made a shuddering noise but only moved a little bit. I pressed to open it again, it made some weird noise. to short to describe, but when I press to close it again this time roof does not move and continue to make a stuttering/rattling noise.

2004-2009 Mazda 3: My cars seatbelt indicator is not working properly

Sat, 18 Feb 2023 02:47:56 -0700

I have a 2008 mazda 3 and a couple years later of when i got it the seatbelt indicator started showing wrong.When i would move the thing that the seatbelt connects it would show that the seatbelt is plugged in when it really wasn't. But now the problem has gotten worse it always show that the seatbelts are plugged in even if i shake the thing that the seatbelts connect it always shows that they are plugged in . If someone knows anything about this please respond!

⟐ Commented February 18, 2023 at 2:47 MST

2009-2013 Mazda 3: Why is my horn not working?

Mon, 22 Aug 2022 08:18:08 -0700

2012 Mazda 3i GT, horn went on fritz two months ago and will not sound. Don't have the service manuals to find where relays and switches are to diagnose.

⟐ Answered August 22, 2022 at 8:18 MST

2009-2013 Mazda 3: Revs too high after service

Wed, 12 Apr 2017 21:57:20 -0700

After taking the car for a second service to reduce the revs I still find them higher than when I bought it. The mechanic said all he did was reset the computer. Is there a way I can change the computer settings or how would I go about changing the revs?

⟐ Answer accepted April 12, 2017 at 21:57 MST

2004-2009 Mazda 3: Mazda 3 2004 2.3L eng chk light on code p2228 & p2004.

Mon, 25 Jul 2016 09:37:13 -0700

The engine have problem on idle sometime eng shutdown

⟐ Answer accepted July 25, 2016 at 9:37 MST

2004-2009 Mazda 3: My back tires are not straight

Tue, 03 Mar 2026 01:32:08 -0700

My car tires are not aligned

⟐ Answered March 03, 2026 at 1:32 MST

2004-2009 Mazda 3: My engine light automatically get on and off code P0661

Sat, 10 Jan 2026 16:39:56 -0700

it get automatically on and off later on or might take some days

⟐ Answer edited January 10, 2026 at 16:39 MST

2009-2013 Mazda 3: Car does not start, it only clicks

Mon, 05 Jan 2026 03:22:25 -0700

But when pressed with test lamp on red wire it starts

⟐ Answered January 05, 2026 at 3:22 MST

2004-2009 Mazda 3: Hazard lights turn on and off randomly

Mon, 20 Oct 2025 22:09:01 -0700

The hazard light keep turning on and off randomly

⟐ Answered October 20, 2025 at 22:09 MST

2004-2009 Mazda 3: Fuel line diagram help twin line

Mon, 21 Jul 2025 17:34:14 -0700

Has anyone got a fuel line diagram for the twin line fuel pump tia

⟐ Commented July 21, 2025 at 17:34 MST

2009-2013 Mazda 3: My fog lights and low beams are not working?

Sun, 29 Jun 2025 04:58:57 -0700

I bought my car used this year in Feb and noticed a couple days after my low beams and fog lights not working. I replaced fuses and relays and still an issue. What can I do?

⟐ Answered June 29, 2025 at 4:58 MST