my 01 F150 won't pass smog. Has 120k miles. mechanic says needs new computer for 800. car guys say my mechanic is reaching because he can't fix my truck. any ideas?.

 

Do a OBD II on it and navigate the pages of documents. Make sure to document all you get. Erase your codes. Disconnect the battery and wait a few minutes. Reconnect start and drive your rig for several duty cycles and retest your OBD II codes and readings. Document and compare your notes. Check your I/M tests ok's are good the rest point you toward your trouble. Probably vacuum hoses and hose clamp replacements first. A small/tiny vacuum leak equals a big migrane. Is your mil on ? If not look to PCV valve and tune up to greatly increase engine calibrations. These simple maintenance steps can save you big bucks. Think about your local parts yard for expensive replacements. check out http://www.easyautodiagnostics.com/ for more info.

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Women might not find you handsome, but they will find you in your F150
Ford Built_Ford Tough

 

DO NOT give the guy $800!!!!! If anything go to a pick and pull and try a used one first. Lots of ways to pass for alot less than 800 bucks!!!!!!

 

Yeah, something stinks.
If your ecm was bad, you'd have bigger problems than not passing emissions.

Get a second opinion.