Date registered: Aug 2006
Vehicle: 02 ML320
Location: Bronx, New York
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RUEY220, please understand that what I had previously posted is for generic code P0221 and to the left of that number is the corresponding manufacturer's code P203 B&C, which will always prevail. Note that manufacturer codes do not have a "zero" before their codes.
Examples: 1. If M/B extracts codes with their scanner and P0300 (random misfire) is revealed, that will be the code that they work with because there is no corresponding manufacturer code to trump it.
2. Then there are manufacturer codes which are proprietary and have no corresponding generic codes. Therefore they can only be extracted using their software.
Always remember that a generic scanner will only put you in the general vicinity of the problem, but it is up to the individual to decipher the information. Because a scanner says code P0221 TPS, that does not mean that the TPS is faulty and must be changed. There are so many variables that come into play that effect the proper operation of components. This is why many members and mechanics alike, become purblind when it comes to code reading, and as in your case, the TPS replacement did not solve the problem.