linyangwind2739

OBD II: p0126 insufficient engine coolant temperature for stable operation

不明白，连修车的人也不知道。

lovelysummer

COOLANT是否不足?  保证COOLANT足够之后,热车足够长时间,如果还是显示COOLANT温度不足,则可能是测量COOLANT温度的那个SENSOR坏了.

linyangwind2739

开贴的时候并没有把所有的信息写上去，抱歉。

0. focus 2003, 101000公里
1. coolant　已经充足。
2. 在出现这个毛病一星期之前，曾通过电脑检查出来p0303 和0p316, 并根据此信息将4对火花塞和线一并换掉。之后engine light 正常
3. 开高速从渥太华回来的时候灯又亮了，去时正常，我以为是coil pack坏了，上次换火花塞和线并没有解决问题，就去找他们，结果电脑显示出当前的毛病是p0126，一个新毛病？
4. coolant temperature sensor 可能是一个毛病，不知道还有没有其他的可能，请告知。

另，因为车没有空调，跑高速时没开窗，将风扇打开，让外面的自然冷风吹进车里。不知这样是否可能（因为风冷？）导致sensor “觉得”温度低？

acorn

I hope that the garage you went to have the program for the year and model your car. Otherwise, the fault code could be misleading.

If the fault code is correct, you may want to check whether the thermostat is operating properly and maybe the sensor (ECT and/or CHT) is malfunctioning.

Good luck.

linyangwind2739

"I hope that the garage you went to have the program for the year and model your car. Otherwise, the fault code could be misleading." that I do not know.

Is it possible for me to tell whether the thermostat is operating properly? Or, I must go a garage to do that. I am trying to eliminate other possibilities. Thanks a milion.

acorn

These are not things that you could verify yourself.

If I were you, I would go to a garage specialized for Ford. Small garages may not purchase the software for each specific model, which may make the fault code misleading and meaningless. Or you could leave it for a little while and see since you know that the coolant is enough and not leaking... I don't know how well you car runs. So this will be your call. Hope this helps...

linyangwind2739

Thank you very much, Acorn. There is no leaking for sure and ford dealer checked the status of the car in Dec 2007. They said all most expensive parts of the car were fine.

The light has been mannually turned off and I was advised by the garage exactly the same as what you mentioned (wait for a while to see if it comes back on).

Thanks again.

franklione

GOOD  LUCK

linyangwind2739

请问您为什么断定是那个东西坏了呢？ 我做了一些研究，也觉得可能是它的问题，但是无法确定，车子一切都非常正常。市区里水温表正常，一开高速，温度马上降下来，而且非常低。觉得是调节器 stuck open。今天去了一个我比较信赖的修车师傅那里，他居然说这种事情不重要，灯亮了你把它弄灭了继续开就行了，说什么不给我看，说没事，真拿他没办法。

好在据说这个东西(thermostat)不贵而且容易换，可是在不希望下次开着开车又亮了。

lovelysummer

Post by linyangwind2739
请问您为什么断定是那个东西坏了呢？ 我做了一些研究，也觉得可能是它的问题，但是无法确定，车子一切都非常正常。市区里水温表正常，一开高速，温度马上降下来，而且非常低。觉得是调节器 stuck open。今天去了一个我比较信赖的修车师傅那里，他居然说这种事情不重要，灯亮了你把它弄灭了继续开就行了，说什么不给我看，说没事，真拿他没办法。

好在据说这个东西(thermostat)不贵而且容易换，可是在不希望下次开着开车又亮了。

开市区的时候水温正常,说明那个测COOLANT温度的SENSOR工作应该正常,出问题的可能性不大; 你有没有查过你散热器的电子风扇,是不是处于常开状态? 通常开市区的时候,风扇启动; 开高速的时候风扇自动关闭. 你可以在冷车启动的时候查一下. 这个只是我个人的猜测,对不对就不知道了. 另外, 下次你在高速上试试不开车内的外循环风,这个时候水温是否回复到正常.