Tip & How-To about Mitsubishi Lancer

Car Air Conditioners

If your are sure that the destination is close by, please try to switch off the A/C. You will save a lot of fuel allowing the engine to trim back the temperature before switching off.
This would also improve the life of the A/C specially if you can switch off when the thermostat has switched off.
If you repeat this it would be good so that you will never crack the engine witht he A/C powered on. Your battery life will improve without any strain on the starter.

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engine rough idle


this could be a lot of different things.going on here could be bad gas, clogged fuel injectors, fuel filter, fuel trim, bad pkugs and wires please tell more and what have you replaced

Dec 04, 2013 | Nissan Frontier Cars & Trucks

1 Answer

code P2187 on 2008 Suzuki Forenza


DTC P2187: Fuel Trim System Lean at Idle

Fuel Trim Description
The Engine Control Module (ECM) controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel economy and emission control. Fuel delivery is controlled differently during Open and Closed Loop. During Open Loop, the ECM determines fuel delivery based on sensor signals without Heated Oxygen Sensor (HO2S) input. During Closed Loop, the HO2S inputs are added and used by the ECM to calculate short and long term fuel trim fuel delivery adjustments. If the HO2S indicate a lean condition, fuel trim values will be above 0%. If the Heated Oxygen Sensors (HO2S) indicate a rich condition, fuel trim values will be below 0%. Short term fuel trim values change rapidly in response to the HO2S signals. Long term fuel trim makes coarse adjustments in order to maintain an air/fuel ratio of 14.7 : 1.

This code can only set when the engine control is in Closed Loop. The engine must be fully warmed up.

This must be diagnosed using a scan tool that can read engine data in order to determine the actual cause of the problem. It can be caused by the following things:

> Vacuum leaks
> Malfunctioning, dirty, or skewed Mass Airflow Sensor (MAF)
> Malfunctioning or skewed Manifold Absolute Pressure Sensor (MAP)
> Dirty or sticking injectors
> Malfunctioning or improperly programmed Powertrain Control Module (PCM)

Aug 17, 2011 | Suzuki Forenza Cars & Trucks

2 Answers

function of oxygen sensor?


It measures the oxygen in the exhaust system, for instance, if the fuel is to rich it sends values to the computer and the computer will adjust the fuel and timing to bring it back into perimeters

Jun 20, 2010 | 2003 Mitsubishi Galant

7 Answers

My name is Shawn and I have a 2001 toyota corolla. I just replaced the front oxygen sensor,coolant temp sensor and new plugs. But still my engine light is coming on with a P0171 engine to lean code. What else could be wrong or cause this? The only thing I have left to replace is the mass air flow sensor. Would this be recomended as the next step as to remedy this? Please respond with an accurate answer as possible thank you


P0171 means Fuel Trim System Lean (Bank 1)

The MAF (Mass Air Flow) Sensor is dirty or faulty.

Note: The use of "oiled" air filters (K&N, etc.) can cause the MAF to become dirty if the filter is over-oiled

There could be a vacuum leak downstream of the MAF sensor.

If your FT is leaning it that much, I would suspect an O2 sensor or it's circuit is the problem. When that O2 sensor went to 2V, I think you found your problem. The O2S is telling the PCM that the fuel ratio is way rich, so the PCM is assigning a way lean fuel trim.

Replacing the Mass Air Flow Sensor should do the trick.

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Oct 07, 2009 | Toyota Corolla Cars & Trucks

1 Answer

p1165 code in my 2001 hyundai santa fe?


I'm not quite sure about the code in Hyundai's case but it definitely relates to fuel trim...

I could try to hash down the explanation for Short term fuel trim and Long term fuel trim in this post but I think a visit to
http://www.wellsmfgcorp.com/pdf/counterp_v6_i4_2002.pdf
would be more thorough and appropriate.

Basically, a high value of long term fuel trim indicates that your engine has had and will have to continue to inject a lot more or a lot less fuel to attain the correct air/fuel ratio for a proper burn, which mainly indicates a malfunction somewhere (could be lots of things)

Aug 27, 2008 | 2001 Hyundai Santa Fe

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