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Cel Fix Test
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So your car's CEL (Check Engine Light) is on and you had the codes scanned at a local parts store. Your car has either a P0171, P0174 lean fault code or both stored in the computer, these codes are based on Oxygen Sensor (O-2) readings. A lean code or codes indicate that there's too much oxygen in the exhaust. Remember parts stores have employees that have good intentions but they may not have the experience necessary to interpret what the trouble codes really mean. These codes are based on oxygen measurements in the exhaust. A common mistake with lean codes is to replace the oxygen sensors. This could be a very expensive mistake that will not fix the problem. Especially if both codes are present, because the chance of both O-2 sensors failing at the same time is very unlikely.
Most likely the cause is a vacuum leak. A vacuum leak can be caused from a vacuum hose, intake gasket or maybe even a leak in the air intake hose from the MAF (Mass Air Flow Sensor). Listen for a hissing sound that may lead you to the source of the problem. Some technicians will use a propane bottle with a hose attachment to help pinpoint vacuum leaks. With today's computers it's not quite as easy to check for vacuum leaks this way because the ECU (Electronic Control Unit) will compensate quickly for the added fuel and a change in idle is harder to notice. Oxygen sensor readings can be monitored with a scan tool while checking for leaks with propane, by looking for increased readings when enriching the mixture. Another way technicians can check for vacuum leaks is with a smoke test. By introducing smoke into a vacuum hose on the engine, the leak will be revealed when the smoke escapes from the problem area.
Aftermarket air filters that use oil on the element can sometimes damage the MAF. Over oiling the air filter may allow some excess to get on the MAF sensor wire or element. This can alter the reading, fooling the ECU into seeing more or less air flow therefore changing the air/fuel mixture incorrectly. I once worked on a car that would not start that had a problem with a MAF. When looking at the wire in the MAF, there was a burned piece of trash that made it's way past the air filter. After cleaning the sensor the car ran perfectly. The ash that was on the MAF sensor wire was altering the reading by enriching the mixture so much that the car could not run. After talking with the customer, he said the air filter was just changed. This was obviously when some trash got into the air intake hose that settled on the hot wire of the MAF.
Fuel Pressure could also cause a lean condition. If the fuel filter is clogged or the fuel pump pressure is low, there could be higher level of oxygen in the exhaust also. Most of the time though, the ECU will compensate for the reduced fuel volume. So this is one of the least likely causes of a lean code.
About the Author. Hi I'm Dennis Bandy, thanks for reading. I've been an ASE Master Auto Technician for over 20 years and have also sold professional auto tools since 2005. I am in a unique position to help readers with automotive repair related topics since I've had personal hands on experience with many auto repairs and automotive specialty tools. This is not a hobby for me, this is my business. Your feedback is really appreciated, if you thought this article was helpful or informative, please rate it below (thank you in advance).
Half the battle when it comes to auto repair is having the right tools, that's why we have supplied name-brand automotive tools (like OTC, Makita, Ingersoll), shop supplies and automotive shop equipment at discount prices, at DenLors Tools since 2005, many readers put us on their favorites list and visit our site when auto specialty tool needs arise, we hope you do the same.
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Can Emissions be done when the CEL is onn for a 98 car?
Hi, I need emissions and my CEL is onn. I know exactly why it was onn and I have recently fixed it. But the CEL goes away after 2-3 engine running cycles. Can I take it to them now (while the CEL is on) so they can do OBD2 emissions test on that car sucessfully?
the car is running fine now and if CEL turned off manually, it wouldn't turn onn again.
Thanks
If you have in fact fixed the problem, the light shouldn't still be on, although some of the codes and data may still be in memory.
Take it to autozone and have them read the codes out for you (free). You've no doubt missed something.
Here in Illinois, CEL on is an automatic emissions failure.
2000 Nissan Maxima SE from North America - Comments
Re: 27th Feb 2009, 10:24. It's really a shame, and at the same time I feel angry at the fact that we all have the same problems with the 200 Nissan Maxima!!
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