AboutRoland Finston Expertise I specialize in Chrysler Corp. front wheel drive cars and minivans for the years 1982-2005 based upon my 50-year DIY experience and factory shop manuals. I don't have expertise/manuals for Jeeps, Trucks, Imports. Today on vacation, I will not take questions at any time, nor answer you within 1/2 hour. If I am shown as "maxed out" try again, in an hour, as I may be answering another question or otherwise busy. There are answers to ten thousand Chrysler questions at your finger tips: put a few key words in the "find" box (above) or click on "view past answers".
Question I have a 1997 Plymouth Grand Voyager Rallye. After taking in for 90,000 mile service, the "Service Engine Soon" light will come on periodically. Running the self-diagnostics produces a flashing MIL code of 45 and 21. What do these mean?
Thanks for your help.
Answer Hi Rey,
The 21 says the oxygen sensor mounted on the exhaust manifold shows no changes in voltage as it should or is reading a high voltage which it shouldn't both of which suggests that it would be appropriate to check for broken/shorted wires at the sensor and if none are found then replace the sensor in any case.
The 45 code is not relevant to that vehicle as it is about the boost limit of a turbocharger set-up being exceeded. I can't explain why it should show up unless the PCM is from a different vehicle. Are you sure about count? If it were 55, that would be proper as it means 'end of readout'. I am also a bit surprised that you could get OBD-I codes on a '97 as that year was supposed to be cvonverted to the OBD-II 4-digit code system.
Roland
