Error codes on 1996 Discovery
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Your engine computer (ECM) monitors lots of things and makes adjustements to compenstate for wear on some parts, driving habits, etc. The 1178 code indicate you are reaching the limits of how far it can adapt things. But the 1187 code indicates an oxygen sensor has a problem with the heater circuit wire going to it. The O2 not operating could trigger the first code as well. Check connections when cool.
Last edited by Savannah Buzz; 01-31-2012 at 08:13 PM.
#4
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I have only had the truck for about a week. The only thing I have done so far is put new tires on it. It currently has 137,000 miles on it. It was a one owner vehicle and the guy that had it before me took great care of it. The check engine light was so so I ran the codes. It also has the SRS light and ABS light on. The engine seems to be running perfectly.
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Well I ordered the O2 sensors and when they arrived they were the wrong ones so I didn’t get a chance to replace them yet. I ordered a new set today. I drove about an hour away from my house in the truck to go camping this weekend. On the way there almost anytime I would put the truck in neutral to slow down the RPMs would drop very quickly and the truck would either want to stall or would. When I drove it home today it was doing the same thing. When I pulled up in my drive way the truck was idling very rough and slightly below 1000RPMs. The check engine light hasn’t come on again since I cleared the codes, but I ran them again and the only one that showed up this time was P1178. The only thing that I have done so far is put a new air filter on it as well as run a can of sea foam through the engine. I have also been putting the highest grade fuel in it.
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