Question about Hyundai Sonata

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My car dos not pass DEQ the check engine is not on but the things that came up as unready are catalyst, evaporative, O2 sensor, O2 heater and they say i need t drive the car more because the battery was disconnected i did drive for over 40 mills but still cant pass is there a way to reset it all

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The items listed here are all two drive cycle monitors. which means there must be two consecutive tests of the systems. separated by some amount of time. resetting the system will clear the monitor data and the process will start over.

Posted on Dec 12, 2008

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I have 96 buick code p0420.I have replaced the converter and both 02 sensors.mil came back on code p0420. do not know what to do next, help.


fault code that is set when the Onboard Diagnostic II (OBD II) system sees a drop in converter efficiency. The OBD II system monitors catalyst efficiency by comparing the switching activity of the upstream and downstream oxygen sensors in the exhaust. The upstream O2 sensor in the exhaust manifold reflects the condition of the exhaust gases as they exit the engine. The downstream O2 sensor in or behind the catalytic converter reflects the condition of the exhaust after it passes through he converter.

Aug 02, 2008 | Buick Regal Cars & Trucks

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No no it wasn't because of the O2 sensor that it didn't pass it was a couple of things that came up and the we're Catalyst not ready Monitor Evap not ready Monitor O2 not readyz


You have 8 I/M or Emission Monitors that have to run clear
BEFORE you can go to inspection

Your Catalyst Efficiency comes from the switching comparison
of the front & rear oxygen sensors being out of range

Until you resolve the rear O2 Sensor Heater Issue you won't
know if the cat is good or you have other problems

You need professional scan tool software & a long road test
to even find a problem,then component test,which apparently
wasn't done when they hung the new rear sensor on based on a code

Apr 30, 2014 | Cars & Trucks

1 Answer

I have check engine light on and whe i checked the code is p4029


P0429 Description The Engine Control Module (ECM) monitors the switching frequency ratio of heated oxygen sensors 1 (front O2 sensor) and heated oxygen sensors 2 (rear O2 sensor).



A three way catalyst converter (Manifold) with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2. As oxygen storage capacity decreases, the heated oxygen sensor 2 switching frequency will increase.



When the frequency ratio of heated oxygen sensors 1 and 2 approaches a specified limit value, the three way catalyst malfunction is diagnosed.
Possible causes - Catalyst Heater Control harness is open or shorted
- Catalyst Heater Control circuit poor electrical connection
- Faulty Powertrain Control Module

Oct 19, 2012 | 2002 Mitsubishi Galant

1 Answer

Check engin light on. There are four error codes P0137,P0141,P0342, and P1792. How do I fix it. Will I pass inspection with these codes?


P0137 Error code Faulty O2 sensor Exhaust leak near the rear sensor
  • Plugged catalyst
  • Short to voltage on O2 signal circuit
  • High resistance or open on O2 signal circuit
Possible Solutions
  • Replace faulty sensor
  • Repair exhaust leak near the rear sensor
  • Check for restriction in catalyst and replace as necessary
  • Repair short, open, or high resistance on o2 signal circuit
P0141 Error code means Downstr Heated Oxygen Sensor Heater circuit fault - Bank No. 1.

- replacement is needed for this issue.

P0342 Error code means Camshaft Position Sensor Circuit Low Input

P1792 Error code means P1792 means the computer isnt properly programmed so if this code keeps comming back the pcm may need to be replaced


Aug 13, 2010 | 2002 Daewoo Lanos

1 Answer

My 1986 nissan pick up did not pass the fuel evaporative controls functional of the smog test can this problem be easily repaired


Yes,

First, take it to an auto parts dealer and tell them the situation and ask if a diagnostics test will help determine the cause. Here are some things that may cause this:

(The DEQ (or test place) should have told you what to replace)

1. O2 (oxygen) sensors
2. catalytic converter
3. emissions unit in the engine compartment
(these are usually located on the passenger front side in the corner) depending on the vehicle make, model.

Please let me know if you need further assistance.

carsandcomps,

Guru, Premium Expert @ Fixya.com

Jun 22, 2010 | 1986 Nissan Pickup 4WD 1986

1 Answer

Having the same problem the other guy described.


First of all, these codes are what are called "Powertrain Trouble Codes' (that's what the "P" means P=Powertrain). TCM Request (Transmission Control Module = TCM). The request was to turn on the 'Check Engine" light.
P0720 - output speed sensor circuit malfunction
P0715 - Input speed sensor (turbin speed) circuit malfunction
P0442 - Evaporative Emission System Leak (Small Leak)
P0455 - Evaporative Emission System Leak (Large Leak)
Check fuel filler cap problems - for Evap Emiss leaks
Replace the pulse generators & have the trans fluid replaced/flushed.
The Main Catalyst System Efficiency Bank 1 Is P0420, not P0442
If you had P0420 code, the catalytic converter is shot... and that's an expensive component.

Oct 06, 2009 | 2001 Hyundai Elantra

1 Answer

My check engine light will not go out therby not alllowing me to pass emissions to get my tag. This is the 8th year that I have had this problem. I ahve spent hundreds of dollars trying to fix this...


possible causes: catalyst monitor, misfire, evaporative system, egr system, fuel system, heated catalyst, 02 sensor, 02 sensor heater air con system refrigerant.

Sep 30, 2009 | 2004 Mazda MPV

1 Answer

1997toy.camry.wont pass deq.?drive cycle is unready.


You'll have to go through the drive cycle. I don't have it offhand but it will take a bit of driving. Try Googling "toyota drive cycle" to find specifics.

Mar 23, 2009 | 1997 Toyota Camry

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