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I have a toyota avensis car the malfunction light is on what does this mean

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This means the computer has picked up a problem with the engine or transmissions operating system. for example it could be a sensor or even a loose gas cap, the computer stores a code with a definition of where the problem is,in what system.
Your next step is to have the computer scanned and the codes read, there are auto part stores like auto zone that will scan the computer and give you the codes. if you write me back with the codes i will be able to help you further. good day

Posted on Nov 03, 2012


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Posted on Jan 02, 2017

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SOURCE: My Toyota Crolla 98 cars' Malfunction indicatore lamp is on, .

It simply means there might be an issue you need to resolve but not necessarily a problem.

Take it for a scan is the best advice but you could also remove your battery terminal for 5 minutes and replace back.

Rate this please.

Posted on Apr 03, 2009

  • 1098 Answers

SOURCE: The malfunction VGR valve

Its an EGR Valve, thats exhaust gas receycler, it basically forces any unburnt fuel from the exhaust back into the engine to reduce the emissions output, you can clean this part and they sometimes are ok agaian, not always but certainly worth a try as a new one is about £90--£150 depending on the make.

Get some carb cleaner and blast it through clean the wire connection to it also.

When the engine light is on you will find it very difficult to get any power, and will really struggle on hills, you can repair this your self it's very easy.

If you need any help please let me know

Posted on Feb 13, 2010

Testimonial: "Thanks for your information! I found it very useful;)"

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SOURCE: Toyota avensis engine management light on car runs

you have an emmisions control part issue. It will need to have the computer scanned to determine the problem. Most emmision related parts will not effect how the car runs but wiil affect fuel mpg.

Posted on Mar 05, 2010

Testimonial: " thanks for the info the MOT sugests that the emmissions are within a pass range but are a bit erratic"

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SOURCE: Toyota Avensis, 2005, D4-D, T3-S.

sounds like your timing belt is stretched do a test with a timing light to ensure the correct timing, check the compresion of the motor you may have valve problems

Posted on Dec 12, 2010

  • 359 Answers

SOURCE: HI I have toyota avensis verso

Air/Fuel Sensor Heater Circuit. (Bank 1 Sensor 2)

The A/F sensors are positioned high in the manifold before the cat and are used to make adjustments to the air/fuel ratio of the fuel injection system. The heated oxygen sensors are positioned after the cat and check the efficiency of the cat (what happened in there as a result of the A/F sensors above). They too can signal changes to the air/fuel ratio. These latter sensors only work when they are hot and need to be electrically heated quickly to give decent information quickly. They work by comparing the oxygen inside the exhaust with the oxygen on the outside.

You could say that the ones before the cat make large adjustments and the ones after make smaller refinements.

It is worth remembering that a fault code could have been stored because at some stage the sensor went outside of its range and for this reason it is always worth cancelling any stored codes as this sometimes puts the light out. There are also several other reasons why a sensor could be showing a fault (it is correctly saying that something else is causing incorrect air/fuel ratio) such as leaky EGR valves or vacuum pipes so just have a look around to see if there is anything obvious.

The DTC code will normally indicate the exact sensor that is faulty or at least showing out of range and not the group of sensors. In this case as you stand looking at the engine from in front of the car it is the top one on the drivers side.

Keep in mind they are sensitive devices (read that as fickle) and although you should start there you can often end up changing more than one and some cases even the cat before you can get them to settle down.

Good luck.

Posted on Mar 07, 2011

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