I have a 40 month old 2008 Scion xB with 22,000 miles. I had the check engine and VSC warning lights come on and therefore took it to Frank Smith Toyota-Scion in Mission, TX. At no charge, they replaced the #4 ignition coil under Service Bulletin Number: SSB-0028-09. (On 2/7/09 at 12,185 miles they also replaced the # 2 ignition coil when the same warning lights came on).
While at the dealership, the service “adviser” said Toyota recommends cleaning the fuel injectors and performing throttle body service. I had no drivability issues and have never heard of such a thing. My maintenance schedule does not mention that anywhere. Has anyone else been approached by Toyota service for this?
Bob

 

no, most of their Toyota service is bull. do it yourself.

 

Its BS you dont need it. If anything run a bottle of Chevron Techron fuel system cleaner if it makes you feel better.

 

yea i agree. I do it with every oil change. 118k on my tC

 

The fact that you have had two coils replaced I would look at the engine harness being the real problem. Have a look at this thread, https://www.scionlife.com/forums/sho...8+main+harness , and see if it seems similar.

 

arent you supposed to change coil packs in pairs though?

 

This sounds likely to me! Having to replace coil packs is very suggestive -- in fact, the entire symptom set raises alarms !

 

As a person who makes my living in vehicle service, let me tell you that vehicles DO need a cleaning service from time to time. We suggest about every 30K to keep the valves & injecters clean. Most gas today SUCKS and causes carbon build-up within 5K miles. My RS6 developed a rough idle at only 9K miles. I switched to Shell fuel with nitrogen and it helped a lot within the first tank. Ran 1 tank with Lucas and engine ran normal again.

I have had engines apart in my shop with as little as 15Kon them and the carbon build-up on the valves and injecters was already getting bad. Inj service is a preventative service, it is not listed in any service manual, but that does not mean it is not needed.