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This is a shot from this morning, does the code plug pink color mean anything? Are these plugs prone to failure?
When I get lousy mileage, the problem is always in my right wrist.
Always go for the basics. Any complaint about fuel economy starts with tire pressures, alignment, rolling resistance and the list of basics can keep you occupied with substantial time before you worry about coding plugs and sensors. My brother drove sixty miles with the park brake engaged on my truck. His first complaint was fuel economy and my comment was he deserved to pay for it because he didn't notice it.
Lastly, mechanics/technicians always are the first ones to be blamed when a new, unforeseen problem pops up by sheer coincidence. I built an engine for a track hoe and within twenty minutes of going to work, the main hydraulic hose popped. The customer was absolutely convinced it was because of my engine.
...fact is they talked me into replacing the complete front brake master cylinder because the old one was leaking and they said it could not be rebuilt.
Could not be rebuilt? Did they say why? There is, after all, a piston rebuild kit in the parts fiche, so "unrebuildable" would seem to imply fatal damage to the cylinder housing itself. Seems like a red flag.
Just to comment, new parts out the box do fail. Don't think that just because they are a BMW shop that the technicians don't make honest mistakes, just like the pilot, Sum Tin Wong on that 777 in SF.
The single biggest reason why I'm so interested in this post is because my own 96 R1100RT and my buddy's 98 R1100RS suffered like yours. In my case, it was one phase of my Hall Effect Sensor, the 180 phase went wonky which was picked up when I read the codes. I could also determine I wasn't going into closed loop with a simple timing light.
My buddy's bike, they had the direction backwards on the tires. They were done by a Beemer approved shop. It took me less than two minutes to find it when I checked his tire pressures that he swears were perfect. But since I'm on my hands and knees once, no point getting up until I have a good look.
All very simple things, and the primary principle in troubleshooting is still KISS and will remain so forever.
I got stories and after almost 40 years on the tools, nothing surprises me.
I really take offense to someone passing judgement on a technician/mechanic unless they have been there, and done that.
As I mentioned earlier, the tires are fine, he wheels are fine and I'm waiting to hear back from them once they figure out the mpg issue and not starting issue. But their credibility is waning after the first thing the service agent said was "I wouldn't expect more than 25mpg from that model and year". It was getting 35mpg when I brought it to them. And I'm now paying over $100 just for the privilege of them telling me what either they missed of did wrong from the $1000 service.