Question about Mazda MAZDA6

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2003 mazda 6, 2.3 liter stock. code P2177, p2676. no vacuum leak with smoke tester. changed out maf sensor. no help. please advise. thanks

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  • edward lai May 15, 2010

    this help greatly. couldn't narrow the problem without ur help. talk to u soon on another car. god bless

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Code P2177, have you sprayed the intake with carburetor spray and see if the engine idle sounds changes which indicates a intake gasket vacuum leak?, this code will never be caused by a defective MAF
also do u have any custom/aftermarket air intake or exhaust parts? they will change the air flow through the engine and trigger this off idle lean code.

P2676 difinition: Air Cleaner Inlet Control Circuit Low, this has to do with the solenoid that controls the variable air duct control valve, this part is on the air cleaner box, once again it is either disconnected or defective, once again have you added a aftermarket intake air system?

Posted on May 13, 2010

  • 2 more comments 
  • edward lai May 15, 2010

    no. the vehicle is stocked. where and what does this solenoid look like? thanks in advance

  • yadayada
    yadayada May 15, 2010

    IT HAS A GREEN I BELIEVE CONNECTOR AN IS LOCATED IN THE AIR FILTER HOUSEING

  • edward lai May 15, 2010

    i do see a green connector in the front of the airbox. i was loose. i reconnected it. problem persisted. idle is still fluctuating

  • yadayada
    yadayada May 15, 2010

    NOT IN FRONT OF THE AIR BOX, IT IS ACTUALLY IN THE AIR BOX.

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Mazda3,2005 trouble code p2177 system too lean off idle bank1


Check for correct fuel pressure.
If fuel pressure is low could be bad fuel filter, fuel regulator or pump.
If fuel pressure is correct could be bad MAF sensor, injectors, O2 sensor or vacuum leak on inlet manifold.

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I have a mazda 3 05 and code p2177 came up


Carlos, this code means that the fuel mixture is to lean during "off idle" [aka just above idle] operating conditions. Proper diagnosis requires a high amount of skill, experience and a real computer scan tool, not just a code reader. That said, the most common causes of this code are either bad oxygen sensor(s) or a bad MAF [Mass Air Flow] sensor. Once a vehicle gets above 70,000 miles on the odometer, the oxygen sensors start to slow down and fail. Often this happens without setting a fault code for a bad sensor. If your car has 100,000 miles or more on it, change the sensors regardless. Replacement of the oxygens sensors will improve your fuel mileage. Another common cause of this code is a vacuum leak.
PS In the future, always state the engine size for your car, as it came with either a 2.0 or 2.3 liter engine.

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P0171 and P0174 are lean codes. There is likely a large vacuum leak or the MAF is bad.

Try starting the car and wiggling the connector for the MAF sensor. Also try tapping the MAF sensor. If the idle changes or the car stalls replace the MAF sensor.

The second shop should recognize that these codes don't have anything to do with the ignition module.

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MAF sensor code P0102. Changed senor, pcv valve, cleaned egr valve, checked intake filter, connections, etc still get code. Not sure where to look next. 3.8 liter 2002 chevy Impala


Check for vacuum leaks at intake, and snorkel. Moniter short term fuel trims. Check Freeze frame of when code P102 sets. Make sure you are using stock air filter system aftermarket filters cause havoc.

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P2197 p2187 p2177 p2195 p2179 p2189


P2197 - Oxygen Sensor Signal Biased/Stuck Lean Bank 2 Sensor 1
P2187 - System Too Lean At Idle Bank 1
P2177 - System Too Lean Off Idle Bank 1
P2195 - Oxygen Sensor Signal Biased/Stuck Lean Bank 1 Sensor 1
P2179 - System Too Lean Off Idle Bank 2

I am not sure what your Mazda is, but from the sounds of it, both of your Oxygen Sensors are shot. Replace them both, or check for vacuum leaks. It may be a good time to inspect and replace the PCV Valve and PCV Valve hose, too.

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Hi:
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.

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1 Answer

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sounds like you have a vacuum leak. It is sucking in extra air from somewhere. possibly the intake manifold gaskets. The extra air coming in fools the computer / o2 sensors to believe it has a lean mixture then it will try to compensate for the lean mixture and add more fuel.

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A code P0174 may mean that one or more of the following has happened:
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In most cases, just cleaning the sensor will fix it. Otherwise you'll have to have all your hoses inspected and or replaced and also a Dirty Fuel filter can cause this code

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