Question about Honda Prelude

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Using my OBD II on 2000 honda prelude trouble codes PO401 & (PO401 pd) all reads MIL on, monitors, 1 INC, EVAP, 7 ready, MISFIRE, FUEL, COMP, CATLYST, 02 sensor, 02 HTR, EGR. Will be cleaning out EGR, BUT do I need to replace my Solenoid? My prelude stalls and ideals out of first gear. (Autotranny). Is this stall caused by these trouble codes? Also with 1 pending code, what do you recomend? I ran car and used OBD II a 2nd time and only change was (0 inc) and 8 (ready).

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  • Honda Master
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I would start with whatever is causing the misfire. That seems to be the core of your emissions codes. Putting all codes together it seems to be clogged injectors vacuum leak. Seems to be causing stalling too.

Posted on Jun 10, 2017

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SOURCE: diagnostic codes I got from 2002 lancer P0421

This all comes down to the catalytic converters. More than likely you will need to replace both of them plus your sensors as well. This can become very expensive with OEM equipment. I would suggest you shop around and see which is cheaper but still has good parts. Hope this helps! Have a good one!

Posted on Feb 21, 2011

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I have no idea about cars so my maxima 01 service light on i scaned it n say 2 codes come on loke p1401 mil on, monitrs, 1 inc, EGR, 7 ready, misfire, fuel, comp, catlyst, Evap, 2 snsr, 2HTV WHAT DOES THIS...


Only 1 code (p1401) means EGR Temperature Sensor problem. Bad Sensor or EGR valve may need to be replaced. Autozone has some ways to test your sensor and egr valve.
If you do have a bad sensor it is about $170 average. If you have a bad EGR valve it is about $150 average.
Hope this helps!!! Let me know if it does!
-Kevin from KCG InnovationsAuto specialist

May 08, 2012 | 2001 Nissan Maxima

1 Answer

What is the drive cycle for a 1999 vw jetta


The drive cycle is as follows
For all OBD2 VW's

OBD-II Drive Cycle Stages
The OBD-II Drive Cycle is an eight-stage course, as illustrated in the
chart on page 3. An explanation of each step is provided below.
Stage 1: Cold Start-The ECM determines the presence of a cold start
by comparing the engine coolant temperature to the ambient air
temperature during startup. The engine is considered cold when:
• Engine coolant temperature is below 122°F (50°C).
• Engine coolant and intake air temperatures are within 11°F (6°C) of
each other at startup.
During this period, the O2S heater, misfire, AIR, fuel system, and EVAP
monitors run.

Stage 2: Idle 2½ Minutes-Turn the air conditioning (A/C) and
headlights on to help the misfire monitor-the additional electrical loads
help even out combustion pulses. During this period, the O2S heater,
AIR, EVAP, misfire, and possibly fuel system (if operating in closed loop)
monitors run.

Stage 3: Accelerate-Prior to accelerating, turn off the A/C and
headlights (if possible). Open the throttle halfway until you reach
55 MPH (89 KPH). During acceleration, the misfire, fuel system, and
EVAP monitors run.

Stage 4: Steady State Cruise-During this portion of the cycle, the
O2S, AIR, EGR, EVAP, misfire, and fuel system monitors run.

Stage 5: Decelerate-Gradually coast down without applying the
brakes. Also, on manual transmission vehicles, remain in high gear and
do not press the clutch. During this period, the EGR, EVAP, and fuel
system monitors run.

Stage 6: Accelerate-Apply ¾ throttle until reaching 60 MPH (97 KPH).
During acceleration, the misfire, fuel system, and EVAP monitors run.

Stage 7: Steady State Cruise-During this period, the CAT, O2S, AIR,
EGR, EVAP, misfire, and fuel system monitors run.

Stage 8: Decelerate-Gradually coast down without applying the
brakes. Also, on manual transmission vehicles, remain in high gear and
do not press the clutch. During this portion of the Drive Cycle, the EGR,
EVAP, and fuel system monitors run.

You can try this a couple times, but if it doesn't work you should go to a VW specialty shop like the dealer or a shop that does mostly European cars and they can use the scan tool to force the car through readiness.


Oct 11, 2010 | 1999 Volkswagen New Jetta

3 Answers

Can't get my 96 chev s-10 to pass inspection due to Not ready codes. I recently change the battery and have driven the veh about 200 miles. Autozone checked and said it was all good but the state...


Here is the drive cycle procedure for that vehicle, and let me know if you require any further assistance.


Running an OBD-II Drive Cycle

The purpose of the OBD-II drive cycle is to run all of the onboard diagnostics. The drive cycle should be perfomed when any trouble codes are erased from the PCM or if the battery was dis-connected. Performing the drive cycle will reset the monitors so that any further trouble codes can be detected.

The OBD-II system drive cycle begins with a cold start with the coolant temperature below 120 degrees F. and the coolant and the air temperature sensors within 10 degrees of each other. (The ignition key must not be "on" or in the "Run" position until the cold start or the heated O2 sensor diagnostic might not start)

1. As soon as the vehicle starts up, idle the engine in drive for two and a half minutes with the AC and the rear defrost on if equipped with a rear window defroster. The OBD-II will check the O2 sensor circuits, the air pump, and the EVAP purge.

2. After the two and a half minutes turn off the AC and the rear window defrost, and then accelerate to 55 mph at half throttle. OBD-II checks for any ignition mis-fires, fuel trim, and canister purge.

3. Hold steady at 55 mph for three minutes. OBD-II monitors the EGR system, the air pump, the O2 sensors and the canister purge.

4. After the three minutes decelerate down to 20 mph without using the brakes or the clutch. OBD-II checks the EGR and the purge functions.

5. Accelerate back up to 55 mph at half throttle. OBD-II checks for mis-fires, fuel trim, and purge functions again.

6. Hold steady at 55 mph for five minutes. OBD-II will monitor catalytic converter efficiency, for any mis-fires, EGR function, fuel trim, O2 sensor operation, and purge functions.

7. Decelerate to a stiop without using the brakes or the clutch. OBD-II makes a final check of the EGR system and the canister purge functions.

Sep 12, 2010 | 1996 Chevrolet S-10 Pickup

2 Answers

All of a sudden my car has a miss and lack of power, a stumble when starting off.. The last time this happend it was a coil for cyl 3 & 8. how do I check this out ?


A SCAN TOOL WILL TELL YOU WHAT CYLINDERS MISFIRING.THATS QUICK WAY TO CHECK.CHANGE FUEL FILTER AND CLEAN FUEL INJECTORS BY FILLING GAS TANK AND PUTTING A BOTTLE SEA FOAM IN TANK.MISFIRING LACK OF POWER AND STUMBLING ON ACCELERATION MOST TIME CLOGGED FUEL INJECTORS WILL CAUSE THOSE PROBLEMS.

Jul 12, 2010 | 1995 Oldsmobile Aurora

1 Answer

I have a cylinder misfiring (according to the CODE) - what do i need to do to repair this?


A misfire that occurs in a given cylinder will set a P030X code where "X" will be the number of the cylinder that is misfiring. For example, a P0302 code would tell you cylinder number two is misfiring.

The misfire might be due to:
1. a fouled spark plug,
2. a bad plug wire,
3. a defective ignition coil in a DIS system,
4. a clogged or dead fuel injector or,
5. a loss of compression due to a leaky exhaust valve, leaky head gasket or worn cam lobe.

On some vehicles, the OBD II system itself will disable a cylinder if it detects a high enough rate of misfire. This is done to protect the catalytic converter. By shutting off the cylinder's fuel injector, the OBD II system prevents unburned fuel from passing through the cylinder and entering the exhaust. Raw fuel in the exhaust is bad news because it makes the converter overheat, and if it gets too hot it can suffer damage. What else does OBD II add to the equation? It also monitors the operation of the catalytic converter with a second oxygen sensor on the tailpipe side of the converter. By comparing upstream and downstream O2 sensor readings, it can determine how well the converter is doing its job. If converter efficiency drops below a certain threshold, the OBD II system will set a code and turn on the Check Engine light.

OBD II can also detect fuel vapor leaks (evaporative emissions) in the charcoal canister, evap plumbing or fuel tank by pressurizing or pulling a vacuum on the fuel system. It can even detect a loose or missing gas cap. In addition, OBD II can also generate codes for various electronic transmission problems and even air condition failures such as a compressor failure.

Hope help with this.

Mar 12, 2010 | 2003 Volkswagen Beetle TDI

1 Answer

My 2005 neon failed emissions. It gave me a codes 0441. What excatly does that define?


Trouble Code: P0441 (2.0L L4 VIN C Auto)
EVAP Purge Flow Monitor Fault Print this code dataprint_icon_codes.gif Number of Trips to Set Code: 2
OBD II Monitor Type: CCM Details
Indicators: MIL Details
Trouble Code Conditions:
Engine at idle speed in closed loop for 200 seconds, BARO Sensor signal less than 8,000 feet, ECT Sensor more than 160ºF, no Low Fuel, MAP Sensor signal less than 23.7" Hg, and the PCM did not detect any purge flow through the EVAP system during this test.

Possible Causes:
  • EVAP purge solenoid vacuum line loose, leaking or restricted
  • EVAP purge solenoid stuck leaking, stuck open or stuck closed
  • EVAP purge vacuum line to canister leaking or disconnected
  • EVAP canister leaking, damaged or has failed

2005 Dodge Neon - All Configurations - P0441

Nov 01, 2009 | 2005 Dodge Neon

2 Answers

Check Engine Light is on and the code is P0303


Hello I need a help.
I have 1999 lincoln town car 4.6L V8.They have check engine light on. P 0303 cylinder 3 missfire.
I was changed spark plugs,fuel filter. check compression test 150psi. fuel pressuer 50.
swiching cylinder 1 to 3 fuel injector and coil. but they still have engine code

Feb 27, 2009 | 1999 Lincoln Town Car

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