My engine light goes on usually when it's raining. the typical MIL codes are
It's any combination of the above codes.
I changed the O2 sensor about 3 yrs ago. the fault(s) clear themselves after some time.
tia,
Mel P.
12 is fairly common, but in combination with a lot of other codes the first thing I'd check is the contition and connections on your battery. A loose or corroded connector can set lots of errors. 22 is engine coolant, a out of range can be several things. - a loose connector (open) - a shorted connector - bad reference voltage (battery) - simply a dead sensor. (these things are fairly hard to kill) 47 No significant change in battery voltage was detected. That is telling me you need to check the battery connections and make sure it is not running dry. If you look at the battery and the sides are bloated then you need a new battery. 72 is the tail side sensor. It's there to determine if the catalytic converter is going. In the 96 I don't believe it was part of the engine control and is basically an idiot light for the converter.
At 96, it's very possible the converter is going. A new one, installed by a good local muffler shop should be $100-$150 Jeep is very pricy on these, but aftermarket is just as good.
Doug,
I really appreciate the feedback. It sound like I need to check battery connections. The battery is about 7 months old. The muffler and cat converter is about 1-1/2 yr old.
Mel
I would check the wiring to the tail side sensor too. "usually when it's raining" says some connection is getting wet, possibly corroded as a result. These Jeeps have "waterproof" connections for most things, but they can still get water in them. Clean the battery terminals on general principles and get a pair of those felt things that go under the terminal clamps. On my 1995 I discovered it was also time to remove the battery box and clean, prime and paint it.
Cheers,
Earle
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Check your alternator (fan) belt. Make sure it is not slipping when wet. Consider one of those cheap digital volt meters and monitor the battery voltage while both dry and wet. Bet the wet voltage is way low.
Remember that wires have two ends - check the connections at the alternator as well - both the power feed (big wire) and the smaller control wires. Your regulator is built into the alternator but there are control wires from the outside. Moisture will, in general, make any corrosion more resistive.
Couple other things to check.
The chassis and motor ground. Just follow the battery ground connection.
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