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The steering gets hard because the engine has stalled, it is not a problem but a symptom. In modern computer controlled vehicles the engine is monitored constantly for problems, when one occurs a fault code is set with very few exceptions. What you need to do is go to an Autozone or other discount parts store and ask for an OBD2 (On Board Diagnostics Generation 2 OBD2) fault test, it is free, once you have the fault codes you can post them here and we can advise on what might be the problem, in your case it is likely fuel or ignition related.
P0452 is related to the Evaporative Emissions Control system and has nothing to do with the 4WD system.
The P0452 may be something as simple as a loose or bad gas cap.
The 4WD system is somewhat complicated and requires more diagnostics.
P1870 generally means that the transmission is slipping. P0420 relates to an issue with a vehicles catalytic converter. To know specifically what each code is, as it relates to your vehicle, you should take it to a local auto-part store (like AutoZone and have them pull the codes off of your vehicle. At auto part stores, they generally do this service for free and it is pretty quick. Regards ~ JD
is the "service engine soon" warning indicator on?? if so have the code read at a local autozone!!its free!! post the code on fixya!! If there is no warning indicators lit, check the following: IAC valve (intake air control valve), tune-up, or possible cam or crank sensor intermitted malf. hopefully this help'd