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Car surges during acceleration hooked up code reader and says 3 incomplete 02 heater catlyst evap

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Posted on Jan 02, 2017

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SOURCE: surging during acceleration

If it always, under acceleration, reguardles of what gear you are in, it is must likely, your ignition wires. If it's while coasting, past 45, vehicle in fourth gear, then it would be an isue with your trans. i.e. trans coming in and out of fourth gear or a torck converter clutch problem. Should have codes. If so what are they?

Posted on Jan 16, 2009

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timsauto123
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SOURCE: experienced pre-ignition type valve noise during

sounds like could possibly be cam sensor,have it checked on a full data scan,if ok probably a coil or wire.












TIM............

Posted on Dec 01, 2010

  • 156 Answers

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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tiger1vic
  • 54 Answers

SOURCE: diagnostic codes I retrieved P0421 misfire fuel

Try this site - good resource for OBD-II codes and possible diagnostic steps.

Posted on Feb 21, 2011

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Hello again. I have the 2006 Nissan Altima 2.5S ......ok I had the issue bank 1 sensor 2 heater circuit low P0037 is the code I was getting. But when I connect the code reader it says that the heated 02...


O2 Emission Monitors & Evap Monitor-- are two
different systems

Get ALL your OBD Codes & work them one at a time,
& DO NOT Clear any data with code reader or removing
battery cable, or the monitors ALL have to run again

The heater may work in the sensor, but the sensor doesn't
switch fast enough or is worn out & the front sensors get
replaced at 100,000, before they fail or slow down

The Evap Codes will be needed, to work on that issue
That monitor runs last & only every few days

IF--- you had professional scan tool software, you would see
11 monitors & maybe 8 that run on your vehicle

There will be at least 2 for the O2,one for cylinder misfire,
one for evap, one for egr,& three others

Oct 21, 2014 | 2006 Nissan Altima 2.5

1 Answer

Cant clear codes on 02 trailblazer a evap and catlyst keep coming up any help?


Hello Annette, some must be done on a advanced type of scanner home models just wont do it ,and yes some you do have to drive up to 100 miles and or 60 key turns .

Sep 23, 2014 | 2002 Chevrolet TrailBlazer

1 Answer

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...


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.

Jun 09, 2017 | Honda Prelude Cars & Trucks

1 Answer

2005 Civic LX Codes that are reading are PO340,344, also says misfire Fuel, catlyst Evap,02 Sensor, 02 HTR, EGR what issues am i in for?


Sounds like a distributor or timing issue, a common issue with these cars sometimes. Our Civic LX was giving us the same codes, We replaced the distributor and reset the timing... problem resolved. Not sure about the 2005 Civic year model, the ignition system may have changed with the newer models...

May 23, 2012 | 2005 Honda Civic

1 Answer

Diagnostic codes I got from 2002 lancer P0421 misfire fuel comp catlyst EVAP 02 sensor 02 htr EGR What does these code mean?


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!

Feb 21, 2011 | 2002 Mitsubishi Lancer

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

2 Answers

I get a po440 and a po440 pd code


evap emission control system malfunction, po440

Jun 23, 2009 | 1998 Chevrolet Malibu

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