code 40?

1994 FORD RANGER
13,100 MILES
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PSH1
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Vehicle is 1994 Ranger, 3.0L, 2wd, 49 States emission, 131,000miles.
Failed California Smog at 15MPH on all gases(HC 172:CO .73:NO 1354.)Fine at all other tested speeds.
Diag from shop indicates Code 40(?; I am unable to find this code.) Repair recommended is new cats(both) and reman engine install(low compression cylinders #4-100 and #5-130.)to correct rough idle. No recommend of fuel filter, injector clean, throttle body or MAF clean. My question is: what should be the cylinder compression reading and what is code 40?
Any questions, comments, or recommendations will be appreciated.
Sep 19, 2012 at 5:52 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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