Question about 1999 Chevrolet Astro

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Failed Inspection for Code P1491 What.s yhis and how do I fix it Cheap so I can smog

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There is a problem in your radiator fan control circuit.

Check the radiator fan relay and fuses first.

Posted on Jun 11, 2014


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SOURCE: 04 chevy avalanche. failed inspection. OBD11

Hi, a P0446 means Evaporative Emission Control System Vent Control Circuit Malfunction

Full details @

Posted on Feb 06, 2010

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P1491 Code is what

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Apr 12, 2014 | 1999 Plymouth Grand Voyager

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My 1995 toyota tercel failed its smog check due to the OBD system check-fail

Have the fault codes read and that will point to the faults that caused the problem

Apr 07, 2013 | 1995 Toyota Tercel

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My 2001 Chrysler town and country failed inspection for emissions code p1491 what does that mean

you should check the Radiator fan control relay circuit,it is located under the hook inside the fuse box. Check your fuse first.

Mar 15, 2011 | 2001 Chrysler Town & Country

4 Answers

What does the diagnostic test code P1491 means?

Hello jhonney21,

The P1491 is Radiator fan control relay circuit code. It is set if an open or short circuit is detected in the radiator fan relay control circuit.


Feb 25, 2011 | 2001 Chrysler Voyager

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My inspection failed for emission. i received two codes. P0455 and P0410. What are these for?

p0410 code pos causes loose or broken hose on smog pump or bad check valve on exhaust man were smog hose atatches

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Failed smog

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92 suburban 454 v8 failed smog .

First I suggest that you have a code check done Most large parts outlets will do this for free.Control module problems will usually set a code. Just offhand, I'd check the egr valve to make sure the valve is clean and properly opening/closing. If the inspection readings were close but not perfect, sometimes "cheating" a bit by adding 2-3 oz of acetone per 10 gal. of fuel will clean it up a bit. It will not harm the system in that concetration,and will also clean the injector.

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