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San Antonio, TX
classic low voltage issue,test the charging system and make sure the drive belt is attached.
on front of engine above crankshaft timing belt pulley,will have to remove timing cover to access.
po401? most common problem= faulty dpfe sensor and clogged egr ports. po171,po174= collapsed/split pcv tube at rear of throttle body. not saying this is what your problem is,but I have made a very good living replacing these parts with no comebacks.
I would not run it any more,call a reputable shop and have it towed to them before further damage is done if it is in fact salvageable.
absolutely,there are probably codes stored in memory as long as you have not disconnected the battery anyways.
Honestly I have converted MANY navigators to standard suspension over the years because it will drain your wallet faster than the air that it's pumping into nowhere! I have seen issues that seem simple turn into $2-3000 repair bills only to be back the following year with more problems. Just google it and you'll find info on conversion.
I would start by retrieving the dtcs from the powertrain control module,also check for vacuum leaks as they will be pronounced when engine is cold. Take note if any smoke and the color if it when you start it also.
Sounds like a faulty cluster to me. Some clusters will have voltage regulators on the circuit boards that go bad, while others have gauges that go bad. I would have this diagnosed by a dealer level tech that sees these vehicles everyday.
make sure fuses are good,also wire breaks are common to occur at the door to body boot because of flex when opening and closing the door.
check voltage at starter battery terminal when turning the key to the start position.