Question about 2003 Honda Accord

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Honda has two fault codes P0507 and P2279. This is after I repaired the fuel injection wiring that was lunch for a Rat.. Engine runs idles high and then low. suspect air leak. 2003 4 cyl. 87000 miles

The two fault codes came up after I rewired the fuel injectors due to rats lunching on them. Checked but find no other wires. Idles up and down. suspect air leak. Idiot who worked on it before has mickey moused a few things. I fixed them but the engine light is on.

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Posted on Jan 02, 2017

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SOURCE: 1991 Honda Civic 1500 idles irregularly, with check engine light.

I think I would suspect the fuel injectors, especially since that is the code you are getting. Fuel injectors clog up, get dirty, stop working the way they should. They can be cleaned (you can remove them and send them to a company that cleans them and makes them like new, or, they can be cleaned in the car by some garages, or, you can get a can of Sea Foam spray and spray it into your throttle housing several times to try to do some cleaning that way, or, you can dump a can of Sea Foam (non-spray) into your gas tank and run it with the fuel through your injectors). You should probably check when you first start the car to see if you are getting any leakage from one or another injector (one or another may look moist or wet if the seals are leaking). You can also do the long screwdriver test (hold the bit of the screwdriver against each injector in turn and listen with your ear against the other end to see if each is clicking regularly). I would try the Sea Foam first.
I hope this is helpful in getting you started on a fix.

Posted on Dec 16, 2009

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SOURCE: The emission light came on our 2010 Honda Odyssey

Unfortunately, there have been lots of cases of rodents chewing on car wiring. In the last five years or so, wire manufacturers have used soy beans as an ingredient in the insulation coating on automobile wiring,and it seems it is tasty to our small friends. Depending on where you park your car , will make you succeptible to it happening again. The Mom of a friend of mine had $1000 worth of damage to her car wiring, as some chipmunks had a field day with her newer car. She ended up placing some moth balls around where her car was parked, to keep the critters away. If you have wildlife near your car, look out!

Posted on Feb 09, 2010

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SOURCE: 1996 Honda Accord Rough Idle Even After tune up

Perform a valve clearance inspection and adjust if necessary. Tight or sticking valves will cause a misfire or rough running concern. Note: Perform valve adjustment when the engine is stone cold. 4cyl: INT 0.26mm EXH: 0.30mm (V6 engine are hydraulic and no adjust necessary.) Also check for a sticking or stuck open EGR valve. For diagnostic purposes only: Remove the EGR valve. Place a business card over the EGR passage and bolt the EGR valve back on. This plugs the EGR ports and if the misfire goes away the EGR valve is partially stuck open and is defective.
Check for low fuel pressure. Check for low compression. Check cam timing. Check for a weak ignition coil. Also don't over look the possibility of worn or broken engine mounts which cause excessive engine movement and engine vibration. -hope this helps

Posted on Mar 05, 2010

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My audi tt engine light came on aa bloke got codes p2187 p2279 p0507 p0441 p1093

P2187: System Too Lean at Idle Bank 1

P2279: Intake Air System Leak

P0507: Idle Air Control System RPM Higher Than Expected

P0441: EVAP System Incorrect Purge Flow

P1093: Fuel Trim 2 Bank 1 Malfunction

Nov 06, 2016 | Audi Cars & Trucks

1 Answer

Honda has two fault codes P0507 and P2279. This is after I repaired the fuel injection wiring that was lunch for a Rat.. Engine runs idles high and then low. suspect air leak. 2003 4 cyl. 87000 miles

Yes I agree with the air leak theory. Code 507 actually means the computer can not bring the idle speed down using the iac valve.
Look for a vac leak between the throttle body and intake or something holding the throttle plate open.

Feb 13, 2014 | 2003 Honda Accord

1 Answer


P0507 Higher idle speed than expected partially stuck open thermostat engine running colder than normal raises idle speed. Small vacuum leak raises idle speed. sticking throttle cable holding throttle plate open.
P0741 Torque Converter Clutch system stuck off : Code conditions : No engine or transaxle system codes set, engine run time over 5 seconds , Throttle Fluid pressure switch not indicating Park/Neutral,TCC commanded On @ max duty cycle, throttle angle over 8% Trans fluid Temp input 68-248f Degrees not in fuel cut off, trans gear ratio indicates 2nd, 3rd, 4th gear delivered torque 32-150 ft lbs, the PCM detected a TCC slip value that was over the torque limits . most likely cause is bad tcc solenoid or torque converter itself. Trans shop can diagnose and repair

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I have code p0507 & p2187 on my 2004 Saab 93 the idle is rough

Combustion engines operate by burning an air/fuel mixture of about 14.7 to 1-14.7 parts air to 1 part fuel. When the air ratio goes below 14.7 parts, this is called a "rich" mixture. If the air rises above 14.7 parts, it is called a "lean" mixture.

Rich Mixture = Too much fuel, not enough air
Lean Mixture = Too much air, not enough fuel

To keep the engine running properly, the Engine Control Module measures the oxygen content in the exhaust with oxygen sensors and makes adjustments to the mixture by injecting more or less fuel.

P0507 Idle Control System RPM Higher Than Expected

P2187 System too lean at idle

Things to check:
1. MAF
2. Fuel pressure, fuel pump flow rate

Do you have cold air intake?

Run a fuel system cleaner first and reset software. Long Term Fuel Trim Additive. Max Value, Air/Fuel too Lean.

Fault symptom

Malfunction Indicator

The engine may stop after starting, run unevenly and misfire or run
at high rpm.

On-board diagnosis

Type of


Enable criteria:

The engine has started and lambda control is active.An additive adaptation is
carried out.Cooling and intake air temperature 60°C.Fuel level at least

Fault criteria:

The additive adaptation factor is greater than 5.25%.

Diagnostic help


Checking air/fuel ratio. With this DTC, the engine will be getting too much air or too little fuel.IMPORTANTA crankcase ventilation leak may be one reason as to why a DTC is set. Check crankcase ventilation function before starting regular troubleshooting.

Functions in the diagnostic
tool related to the fault:

Test value:
•O2S1 lambda
•Short Term Fuel Trim
•Purge Adaptation
•Airmass Deviation
from Calculated
•Total Fuel Trim Here's a helpful link for you:

You most likely have a vac leak. Hope this helps Fix Ya! Show some love with positive feedback if this brings you to a solution. Thanks Happy Hanna-kwanz-mas

Oct 26, 2010 | 2004 Saab 9-3

1 Answer


this code is for the electronic throttle. do you have the factory wiring harness? had some problems with connectors might wanna look at that and maybe replace connector

Jun 04, 2010 | 2004 Chevrolet Silverado 1500 Crew Cab

1 Answer

I have a 2003 saturn Vue AWD V6 i'm getting error codes PO700,PO335,PO421,P2119,PO102,PO37,PO57,PO44,PO431 when it gets to operating temps it will shut off if left to sit for 30-40 mins it will start...

PO700 is a code telling you there are codes in the TCM of some late model cars where the Transmission control module has been removed from the PCM the vehicles main computer , And basically it happens when the TCM has a issue within itself or the transmission that sets a code and it sends a request for the PCM to illuminate the SES or CHECK engine light. To get at the TCM codes requires in most cases the most up to date scanner software purchased after the cars model year and as of yet is still a little iffy. Standard OBD11 scanners will generally not be able to see these codes.

P0335 (Crankshaft Position Sensor A Circuit Malfunction) first disconnect the CKP itself and inspect the connector and terminals for corrosion. It should be clean and dry. Make sure the weather-tite seal on the connector is in place, uncontaminated and undamaged.
Resistance of the CKP should be 500-900 ohms.
If all good, trace the CKP harness upwards as far as you can (until it enters the main harness) and make sure you don't have any "rub-through" or spots where the wiring appears damaged.

DTC P0421 Warm Up Catalyst Efficiency Below Threshold (Bank 1)
DTC P0431 Warm Up Catalyst Efficiency Below Threshold (Bank 2)
Its too coincidental for both catcons to fault so there's something in common to this error (I feel is) upstream. First there's a V6 engine with separate sets of cylinder banks serving separate catcons with separate pairs of O2 sensors. For both rear sensors to come up simultaneously indicating low efficiency and "runs fine but strong exhaust smell, maybe running rich(?)" suggests a component in common to both cylinder banks; maf, map, iat, ects, tpp, etc.. Any one of these parts plays a role in the overall effect of a running engine and most likely needs monitoring while the engine's running with either Saturn's Tech-tool II or better readers/scanners capable of displaying live data to discern subtle faults translating to either a constantly rich or leaned out condition, abnormal running. Without other error codes to go by, there may be no choice than to seek Saturn diagnostic services other than a local expert capable of interpreting all the information from live data displayed onto a graphics screen to read from all the sensors. Diagnostic specialists.

Possible causes of DTC P2119: Weak throttle body return springs
Throttle plate sticking due to carbon build-up.

P0102 code relates to the Mass Air Flow (MAF) Sensor. The mass airflow sensor measures the speed and density of the air entering the intake manifold. The engine computer converts this input to a Mass of air per unit time to correctly fuel the engine. the code P0102 will set if the MAF sensor signal voltage is less then 0.20volts.

Code P0507 will set if the actual idle speed is greater then 200RPM from what the engine computer has commanded. Possible causes for this code: P0507 is high idle when the PCM wants lower. If you have the 1.9 LT SOHC engine in the 2000-2002 year range this is normal caused by a leaking intake gasket. Can be other sources of vacuum leak or something else that keeps the RPM up when it should not. It may be the Idle Air Control valve sticking.

The other two codes P037 and P044 i an not sure and the code P057 was a guess of P0507 since it's seams to be in the area where the problem is . The P0404 i am guessing it's going to be EVAP problem like a lose or bad gas cap. P0370 is (ECM) replicates the signal received from the crankshaft position (CKP) sensor. This signal is sent to the fuel injection control module (FICM) through the engine speed signal circuit. The FICM uses this replicated signal to generate injection current and control the recharge of the fuel injection high voltage circuits. When cranking, the FICM has full control of the fuel injectors. The only input the FICM uses at this time is the engine speed signal from the ECM. The FICM monitors the signal along with the injection request signals from the ECM after the engine is running. If there is a problem with this signal, a DTC could set.

Start with the simple and clean the Idle Air Control (IAC) valve, and the Mass Air Flow (MAF) sensor. This may help the P0421, P0431. and then check the crank shaft sensor wire harness and replace the sensor, which should take care of the P0370. *** for the P0404, check the gas cap if not replace it. Good luck and keep me posted.

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89chevy truck runs roughly

Isn't it fuel injected? More likely:
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Fault codes, p0102,p0122,po507

po102--maf sensor, could be a bad air cleaner and not letting air into engine, po122--tps pedal position sensor low, replace or adjust tps sensor,or wiring,po507--idle control system high input. for this you can take off idle air control, and clean out carbon from were it mounts on engine. it is just before throttle body at end of air intake hose, it is black. do not push on pintle on end of valve when cleaning, use a old toothbrush to clean carbon off of valve, use carb cleaner but do not soak valve in liquid of any kind. good luck!!

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Code P0507

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