Question about 2005 Mazda 3

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Engine persistently cuts out whilst driving

We have a quote to fix our failing Mazda 3. The error codes given on the quotation from the garage are U1900, B1261, U0100 and U0101 - so basically communications issues I understand. The proposed repair is a replacement of the "Speedometer". Comments and advice gratefully received?

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  • Alan Kikuchi-White
    Alan Kikuchi-White Mar 17, 2014

    its not a 2005 but 2008/09 model


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Posted on Jan 02, 2017

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SOURCE: 03 Mazda 6: Check engine light on, code po174

The oil pressure sensor does not have much to do with the P0174 code so the leak on the gasket is not the cause, usually it is the air mass sensor, or the intake sensor. if you have a leak of oil, this might as well mean that whoever changed the oil did not put the right specs of it and this caused the oil to get through. After some time you will experience that the rpms will reach only certain level and won't go higher. Change oil to the right specs and get the sensor cleaned if not to late or replaced (will be expensive). Gasket change wil be needed as well.

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SOURCE: Mazda MX6 engine cuts out whilst driving


Posted on Jul 29, 2009

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SOURCE: Error code U0101: Lost Comm with TCM

i do have the same problem and i took the car to 5 differant mechanic an dget no solution the aaamco the petboys the mazda dealer another transmission specialist please let me know if u have any solution

Posted on Jul 11, 2010

  • 106 Answers

SOURCE: I had my 2004 Mazda

Codes that begin with the letter U are always communication fault codes between modules in a CAN system. They are basically to be ignored unless a problem is occuring. This is because all of the control modules in your car ( and there are a bunch of them ) are all communicating to each other and sending information between each other on one set of wires called a "twisted pair" Due to the high volume of infomation being sent and received there is the invevitable time when a message will be sent from one module to another and it is lost or not responded to in a timely manner (meaning in milliseconds) When this occurs then a U0100 or other comm fault code is stored.

Posted on May 20, 2011

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