How can I be sure the ecu is bad?

Asked by Feb 21, 2016 at 04:18 PM about the 2006 Volkswagen Jetta 2.5L

Question type: Maintenance & Repair

I have a 2006 Jetta w/2.5 engine. The check engine light flashes when the car first starts then stays on.  The engine runs extremely rough while accelerating.  The OBDII scanner says misfires detected on cylinders 1, 2, 3, 4, & 5.

Is there a test I can run on the ECU to determine if it is the culprit?

3 Answers

114,235

Kinda sounds like bad fuel could be the issue. How long since it's had a good tune up? Plugs, wires, air filter, fuel filter, ect, ect,

5,725

change the 02 sensor...and report back~

O2 sensors (both) were replaced twice. I replaced them about 4 months ago. My daughter (her car), took it to a mechanic who also said they needed replaced so he replaced them also. Didn't have all the misfires at that point. Just the check engine light along with the code stating the 02 sensors needed replaced. The scanner no longer says anything about the sensors.

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