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Old 10-24-2009, 02:08 AM   #1
Mr Yarisman
 
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Check engine light


I change my stock air filter to AFE 51-1130 intake.why my check engine lights on?
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Old 10-24-2009, 02:31 AM   #2
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Make sure it's installed correctly and run the car as usual and wait for the ECU to adapt.
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Old 10-24-2009, 03:00 AM   #3
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Probally loose connection resulting in vacuum leak. Or the seal for the MAF sensor is not seated correctly. If the CEL is on its most likely MAF sensor related. I would wiggle all the hoses and tighten the clamps. Make sure the breather hose is connected correctly to the tubing and if everything looks good disconect the negative battery for a few minutes and reconnect and seeif they light comes back on. If it does you may have damaged the sensative MAF sensor. You can never touch the wires or get any contamination on them.
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Old 10-24-2009, 03:21 AM   #4
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Quote:
Originally Posted by YarisSedan View Post
Probally loose connection resulting in vacuum leak. Or the seal for the MAF sensor is not seated correctly. If the CEL is on its most likely MAF sensor related. I would wiggle all the hoses and tighten the clamps. Make sure the breather hose is connected correctly to the tubing and if everything looks good disconect the negative battery for a few minutes and reconnect and seeif they light comes back on. If it does you may have damaged the sensative MAF sensor. You can never touch the wires or get any contamination on them.

When i install the AFE intake the engine lights came on then I drove it for day then came off now is on again.
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Old 10-24-2009, 11:46 AM   #5
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If you're going to mod your car, you should invest in a OBDII code scanner. You can pick one up easily under $100. Use it for your own CEL or impress your friends...
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Old 10-24-2009, 09:50 PM   #6
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If you're going to mod your car, you should invest in a OBDII code scanner. You can pick one up easily under $100. Use it for your own CEL or impress your friends...
What's the good OBDII code scanner?
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Old 10-24-2009, 10:44 PM   #7
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Scangauge II i presume?
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Old 10-24-2009, 11:10 PM   #8
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I have a Actron CP9135 AutoScanner Diagnostic Code Scanner and a Hypertech tuner with a OBDII scanner built-in. The Actron works great and is probably the most common one found at auto parts stores... It's about $140 but you can find it for cheap on EBay and I've used it on several different vehicles. Remember OBDII is the standard for all cars sold in the US for 1996-up model years.
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