Question about Toyota Sienna
I had the same problem. I replaced the plugs and the plenum gasket as well and it fixed the problem. all is well now. It seems that there may have been a leak in the plenum gasket allowing to much air in during lower RPM. This diagnosis is encouraged, but not confirmed by the fact that at higher RPM, the car runs better, meaning there is less unmeasured air bleeding in vs measured air coming through the MAS.
Posted on Jan 09, 2013
If both upstream and downstream oxygen sensors have been replaced, I would suspect the converter is not appropriate for your vehicle. It is common that when an aftermarket universal type converter, or a low quality replacement is used, it does not perform well enough and sets off a converter efficiency code. Even if it is labeled as "heavy duty" Some vehicles are more sensitive to this than others. Ask the shop that installed the converter exactly what they used, and if necessary, replace it with a high quality converter designed specifically for your year, make, model and engine.
Posted on Mar 12, 2011
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Posted on Jan 02, 2017
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