Last post on Sep 21, 2013 at 10:39 AM
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Buick Regal, Sedan
#3060 of 3508 ext temp sensor & service engine soon light
Nov 26, 2005 (9:25 pm)
hi...i am new to new forum. i have been driving a buiclk regal ls 2000 for close to 2 years. i have some questions here.
1. the ext temp sensor doesn't seem to work. for example, the temperature this morning was in the 40s, but the indicator panel showed 105 F at the start and reached 120 F within 15 minutes of driving on the highway. i have read that this could be due to a faulty sensor, and the best way would be to replace with a new one. Is it expensive to get a new one, or can i drive my car and ignore the temperature indication? there was once the ext temp sensor indicated a very high temperature, and the engine would not restart. i had to wait for a while before the engine could be started. i don't know if engine problem is related to the temp sensor.
2. the Service Engine Soon light came off recently and lasted for a couple of weeks. A few days ago, for some unknown reasons, the light went off. is this a common issue in buick regals? should i ignore it since the warning light has gone off?
thank you. hope to hear some feedback.
#3061 of 3508 Re: ext temp sensor & service engine soon light [soccerball]
Nov 27, 2005 (6:43 am)
The external temperature sensor only controls the climate control with its input; it doesn't affect the motor's sensors and inputs.
The external sensor is in front of the radiator probably on a center vertical support. It's about the size of your thumb. I would try disconnecting it and reconnecting it since there will be a connector somewhere close to it. If the digital control for the HVAC is not flashing when you start up, it's probably just a bad connection or bad sensor. Try GMpartsdirect.com and rockauto.com for the part (I can't find it on rockauto). Also check with Advance Auto and NAPA. I would expect it to be under $40 for a replacement.
The service engine soon light can be gas cap seal. Try a little vaseline on the rubber seal on the cap. Use an oiled cloth to rub the inside of the metal filler tube to remove any buildup. I've seen brown crud from gas or something building up where the contact with the cap is made. If it's not a flashing yellow light, then it's a low level pollution control problem.
If that is what's causing the light, the system retests the seal of the tank and other tubes to the charcoal canister only when started lukewarm. I would drive until the temp gauge just starts up to like 100. Stop car for a while (I got coffee) and then when you restart the car just sit at idle for a minute or two and the light may go off if the pressure test is passed. If the car is warmed above 170 it does not do the pressure test. These were the parameters used for my 98 LeSabre's system when I read the factory manual to learn how its yellow light worked!!!
Hope this helps.
#3062 of 3508 Re: ext temp sensor & service engine soon light [imidazol97]
Nov 27, 2005 (7:15 am)
I found a temperature sensor on gmpartsdirect at $4.40 or so with $9 shipping. You might check locally. There were two different part numbers listed. Check the number for the one you have when you check the connection. But it's possible there's an updated part...
It's cheaper than I expected...
#3063 of 3508 Re: Fog Lamps on '04 Buick Regal LS - Just Decoration? [yurakm]
Nov 28, 2005 (1:38 pm)
>Fog lamps are not "just decoration", but their effect is >rather limited. I would say they are something like 75% >decoration, and 25% substance. Or even 90% decoration, >10% substance in case of Regal.
Well, I was being about 75% sarcastic, 25% serious, but I understand what you're saying. They do serve a purpose, but it seems extremely limited. The only time when my normal headlights aren't on - thanks to the car's sensor - is in daylight. So whenever I might want to use the fog lights, my headlights are on anyway.
I have always been under the impression that the better lights for fog, etc. are the orange/amber lights because it is better able to penetrate fog, snow, sleet, etc. compared to white lights which as you say is reflected back to the driver, not to mention oncoming traffic. And of course rule #1 for bad weather is to never use high beams.
I can't recall off the top of my head what lights the Regal has for "parking" I know the parking lights on the Regal are amber, but I'm not sure if a dim white light also appears. But it's a moot point because one can't drive (at least not with the Canadian model) with the lights in parking mode if it's at all dim outside.
So I guess I'll just let the Regal decide what lights it wants to use and try to remember to dust off the fog light button every so often!