Question about 2003 Mazda Protege

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My mazda5 protoege is over heating one auto tech told me i need to change the heat sensor.

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Thanks for choosing FixYa and welcome to the site. It is possible, but there are other things that can cause it as well. The most common of them all is a thermostat. Next, would be a water pump. Make sure it is not your coolant cap. It could be bad and need changed. They only cost a few bucks. Make sure you are not leaking fluid anywhere. Check your hoses and your clamps. Make sure you have the correct level of coolant. Make sure you check your fans to make sure they work. If they don't, check the fuse. Check your radiator as well. Anyone of these can make your car overheat. If you have a check engine light on, get a code. It can show the cause. If you have no light, check these above and you should find your issue. Thanks for using FixYa and have a good evening.

Posted on Apr 04, 2011

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03 mazda5 long-term trim reading is _78 and short term trim is reading is _ 128


run the fault codes
replace the heated oxygen sensor (HO2S) in the exhaust manifold

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How to change oxygen sensor


1. Special open sided socket to thread the wires I do not know you size but they are available at most auto stores
2. Torch to heat the pipe! O2 sensors are under tremendous heat and the exhaust pipe needs to be heated around the O2 sensor to expand the pipe so you can get the old O2 sensor off.

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An orange light shaped like an engine (maybe ) is on right side of panel. I am due for an oil change. Can that be why? Also I was told I had a minor problem with my heat shield and the mechanic adjusted...


The orange light shaped like an engine is a "Check Engine" light. It has nothing to do with maintainence or oil changes. It is part of the cars computer system and usually indicates there is a problem with the engine that needs looking into. Most times it turns out to be either a sensor,
an eletrical component, or computer has failed. Vehicle owners can purchase a "code reader" in most auto parts stores that will display the stored trouble code ( PO124,PO3021,PO116 .....) and may even tell you what system the problem lies in. But ultimately you will need a well trained tech to track it down and fix it.

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Check engine light comes on and goes out about once a month and then comes back on, i was told it was the heat warm up senor 1 and 2


Have the codes read for free, at most major auto parts stores, and you'll know for sure what is wrong. It could very well be the heating element on the O2 sensors, as you have been told, but get the codes read to be certain.

Jan 16, 2011 | 1997 Oldsmobile Aurora

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My service vehicle soon light is on and i had a mechanic put it on his machine and he says its the heated oxygen sensor, i know my vehicle has 2 oxygen sensors are they both heated sensors? how do i know...


Go to Auto Zone or where ever you prefer to get parts and give them the code-they can tell you which one and price it for you and hopefully sell it to you. Only way you will know, unless you want to change both of them. After you change it you will need to get the code cleared or the light will be back on again.

Mar 16, 2010 | 2001 Pontiac Grand Am SE

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Missing up hill replace wirring spark plug replace fuil filter and i was told that it was the heated oxygen sensor and i replace a 4 of them and it still missing like bacd firring


Who told you to replace the 02 sensors. They arn't even related to this issue. That was just a waste of money. If you got this diagnosed in the first place a code would of told you what cylinder is missing. It most likely would of been an injector issue, a coil issue, or a spark plug issue. This is providing you have no engine damage.
As far as the heated 02 sensor, all the heated part does is heat up the exhaust faster in the few seconds that its purpose is for to reduce cold start emissions.

Now if someone diagnosed this and recommended 4 02 sensors at the same time them the only thing that could of caused all to go out at the same time is a failed PCM and you would of had codes to guide the tech in testing before comdeming the PCM. In this case all the 02 sensors would of still been fine unless one shorted out and thats why the PCM failed.
But no matter what the 02 sensor is not what is causing a misfire under load.

Jan 14, 2010 | 2004 Ford F150

1 Answer

2001 Nissan Maxima service engine light stays on code from Auto Zone scanner is PO139 and PO138. What should my next step be to solve this problem.


code p 0138 refers to 2 items
1--heated oxygen sensor(HO2S) 2 bank 1--high voltage ==causes --wiring short to positive --HO2S---ECM
2--oxygen sensor (O2S) 2 bank 1--high voltage ===causes wiring short to positive ---ECM
code p 0139 refers to 2 items
1--- heated oxygen sensor (HO2S) 2 bank 1--slow response ===causes --heating inoperative --wiring--ECM
2--oxygen sensor (o2S) 2 bank 1 slow response ===causes --wiring --- O2S

heated oxygen sensors9HO2S) are in the exhaust manifold before the cat converter
Oxygen sensors (O2S) are after the cat converter
it is indicated that the HO2S is faulty-
check the wiring and /or replace both sensors

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Bmw trouble code P1624 what does it mean?


Code P1624:M52 coolant temperature below thermostat regulating temperature. Check the temperature of the coolant and also with a scan tool, check the actual reading given by the coolant temperature switch. It could be the thermostat or a coolant sensor.Look also for any broken/corroded wires to the sensors as well.

Apr 18, 2009 | 2000 BMW 3 Series

1 Answer

Where's my O2 sensor located


Heated Oxygen Sensor (HO2S) SPECIAL SERVICE TOOL(S) REQUIRED Description Tool Number Oxygen Sensor Wrench T94L-9472-A
Removal and Installation
NOTE: If excessive force is needed to remove heated oxygen sensor (HO2S) (9F472) , lubricate heated oxygen sensor with penetrating oil prior to removal.
  1. Disconnect battery ground cable (14301) .
  1. Disconnect heated oxygen sensors from engine control sensor wiring (12A581) .
  1. Raise vehicle on hoist. Refer to Section 00-02 .
  1. Remove heated oxygen sensors from dual converter Y pipe (5F250) using Oxygen Sensor Wrench T94L-9472-A.
  1. To install, reverse Removal procedure. Tighten heated oxygen sensors to 36-46 Nm (26-34 lb-ft).

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Heat won't shut off in my 1998 Jimmy


I would suspect your blend air door is in the full open position, which is the default position if any of your hvac sensors report a problem. This could be a sensor problem, a module problem, a mechanical problem, or an unrelated trouble code stored in the body control module. Best to have an Auto tech take a look at it.

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