Why does the Check Engine Light keep coming on and how to close the trunk?

Asked by Aug 28, 2015 at 10:19 AM about the 2003 Volkswagen Jetta GL 2.0

Question type: General

First, I just paid nearly $400 to replace a thermostat, once the CEL light came on.  It's come back on 5 times since then.  3 times the auto repair place took it off with the scanner.  It's been going back on every 3 days, since the repairman took it off.
The timing belt was replaced last year at Firestone, and oil changes are done every 3 months at Jiffy Lube.   The repairman said my engine is fine, but the light keeps coming back on.

Now for what ever reason, just recently the trunk recently closed on its own,.  It worked for 2 days, and when the CEL light came back on so did the open door light.  So I guess nothings broken, but  the noise can be heard, but it won't lock.  Should I get a new battery, the guys at O'Reilly's says my alternator is good, so it keeps the battery good.  What to do?  Other than buy a new car.

2 Answers

146,355

http://www.napaautocare.com/estimator.aspx# -- $182 to replace thermostat

146,355

I sincerely wish I had some good answers.... but I don't . Other than to say there is no sensor or anything that will light the CEL and have thermostat as a DTC code. Overheating, lots of things but there is no code exists specifically for thermostat. And find another place to have your oil changed.. I caught Jiffy-Lube 'red handed' using Havoline motor oil conventional and I had asked for and paid for Mobil1 synthetic. (Nothing wrong with Havoline, just not what I wanted) And Jiffy-Lube has been busted before for services never done but customer paid for. AND services actually done but unnecessary. Most people don't know or pay attention, they trust the place to do what they are supposed to do but get ripped off. You should be able to trust them, and the vast majority are honest. But I bet they always try to talk you in to a transmission flush also. Right? Don't allow that. Also, if you use synthetic motor oil you can go a year or 10,000 miles. Conventional oil 6 months or 5000 miles (whatever comes first) Personally I don't push it that far, I use Mobil1 and change at 8000. Never a problem. Now, A good alternator will not necessarily keep battery good. The average life-span of a automotive battery is 4 to 5 years. Some will last longer depending on quality and number of start/stop cycles

Your Answer

Add photo

Related Questions

  • i have a 1999 jetta power windows inop trunk light on in dash and now engine wont crank battery and starter good 4 answers

    1999 Volkswagen Jetta GL

    -

    General

  • 2012 Jetta Door Lock Problem 10 answers

    I have owned my Jetta for 1 week and on about 5 occasions, the drivers door will not close properly resulting in the door staying open. Has anyone else experience faulty door locks?

    Volkswagen Jetta

    -

    General

  • Car problems 2 answers

    I have a 2001 jetta that blew the plate light fuse. I replaced it but it keeps blowing out. Now it caused a chain reaction with the electronics. If I have my head lights on and turn the car off and...

    2001 Volkswagen Jetta GL

    -

    General

  • keys 1 answer

    are the door/ignition keys the same as the trunk, or are 2 keys required. looking at buying an 87, but trunk will not lock as the key with the car will not turn the tumblers

    1987 Volkswagen Jetta

    -

    General

  • Power windows, moonroof, and trunk are locked up! Any solutions? 29 answers

    My power windows, moonroof, and trunk opener are non functional - locked up. It may have also deterred me from using the key remote to unlock the car because since the problem started, I have to manua...

    Volkswagen Jetta

    -

    Maintenance & Repair

Jetta

Looking for a Used Jetta in your area?

CarGurus has 31,607 nationwide Jetta listings starting at $1,000.

ZIP:

Search Volkswagen Jetta Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Volkswagen Jetta Experts

#1 FordNut
FordNut
Reputation 2,150
#2 Goodwrench707
Goodwrench707
Reputation 2,040
#3 Deathjam4
Deathjam4
Reputation 1,400
View All

Related Models For Sale

Used Volkswagen Passat
241 Great Deals out of 22,284 listings starting at $1,499
Used Honda Civic
858 Great Deals out of 70,842 listings starting at $1,200
Used Volkswagen GTI
113 Great Deals out of 6,211 listings starting at $1,499
Used Honda Accord
1,013 Great Deals out of 75,624 listings starting at $899
Used Volkswagen Golf
42 Great Deals out of 2,776 listings starting at $1,995
Used BMW 3 Series
1,563 Great Deals out of 38,996 listings starting at $1,495
Used Toyota Camry
1,238 Great Deals out of 97,272 listings starting at $1,250
Used Toyota Corolla
999 Great Deals out of 68,490 listings starting at $1,595
Used Audi A4
329 Great Deals out of 12,116 listings starting at $950
Used Nissan Altima
1,089 Great Deals out of 83,139 listings starting at $1,600
Used Mazda MAZDA3
347 Great Deals out of 28,333 listings starting at $1,200
Used Volkswagen Beetle
237 Great Deals out of 8,816 listings starting at $1,800

Used Cars For Sale

2017 Volkswagen Jetta For Sale
14,267 listings starting at $12,779
2016 Volkswagen Jetta For Sale
31 Great Deals out of 1,354 listings starting at $9,993
2015 Volkswagen Jetta For Sale
95 Great Deals out of 3,473 listings starting at $8,037
2014 Volkswagen Jetta For Sale
121 Great Deals out of 3,588 listings starting at $5,995
2013 Volkswagen Jetta For Sale
103 Great Deals out of 2,386 listings starting at $6,270