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Discussion Starter · #1 ·
Take this information for what it may be worth in your instance: My E39 check engine light came on when the vehicle was out of warranty... naturally. The dealer ran the code and said that I needed an O2 sensor replacment. And $300+ later the light was extinguished but only for about a week.

Back to the dealer. This time the dealer said that the new code was for a defective catalytic convertor itself. This time it would be about $1,900 for the pair! Screw it! I set out to find an aftermarket set for much less money, maybe $500 installed for a welded in pair. Not my idea of a proper BMW repair though. In the meantime, I did some research on the web. One obsure post said to try some fuel injector cleaner. What the heck, I did. No results with the economy brand cleaner.

After another month, the orange check engine was just downright annoying. Then for some reason, I sprung for a bottle of top-shelf fuel injector cleaner and got some Techron brand cleaner. I put it in and much to my amazement, the light went off in about a half a tank of driving! And stayed off!

I will admit that I add some Techron every month or so just out of anxiety. I hope to never see that orange light on again. To me it looks like $1,900 saved as long as that damn light stays off. Good Luck with your catalytic error code situations! I would highly recommend trying this inexpensive solution first before shelling out $1,900. Posted by Don Ladanyi

PS. I am not affiliated with Chevron or Techron in any way.
 

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Help from over the pond
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Thats a very cheap fix indeed well done,the reason the light came on was probably due to it running lean.
 

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42, The meaning of life
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Have you noticed better performance since running the injector clean in your car?
 

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Help from over the pond
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Brett, I dont advise it on a 7 series if thats what your thinking, Ive heard a lot of nightmare stories of people putting it in 7's, there are additives put in to fuel to do the job its only required if you are or have been putting supermarket fuel in and not top grade named ie, shell,BP etc.
 

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42, The meaning of life
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I wasn't planning to add anything to mine, but was curious to see if there had been a change in performance from cleaning the injectors. Do you ever run anything through yours to do keep the injectors up to spec, or do you strictly rely on the fuel companies efforts?
What do you recommend for obstructed injectors because my wife's Subaru is shuddering a little at idle?
 

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Help from over the pond
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I rely on the fuel companies to be honest, if I get a problem I just hook up the carsoft, I did take them all out and had them cleaned @ 130,000 miles just to make sure all was well....no difference and the chap who did them said there wasn't really any point as they weren't dirty.....as for your wife's car I would say it would be fine to run some cleaner through,if it still shudders it maybe they need a professional clean I do my work van every 6 months but that's diesel...

I always use top brand cleaner (REDEX over here) in the van and not your £2 a bottle supermarket stuff, last time it was around £6 which does two tank fulls hence every 6 months.
 

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Discussion Starter · #7 ·
The performance and mpg usage seemed to be exactly the same before and after the check engine light went out due to the Techron fuel cleaner additive under normal driving conditions; HOWEVER... I'll swear that it has a lot more punch now on heavy acceleration! Comments please? Posted by Don Ladanyi
 

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It will have more 'punch' due to higher fuel (octane) injection in to the cylinders....creating the "Bigger bang".
 
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