Question about 1996 Nissan Sentra

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Deq obd sensor status

Catalyst - unready
o2 sensor - unready
egr - unready
had my battery replaced and starter about 5 months ago and have driven the vehicle since but deq states showing unready and cant run thru deq - had friend hook up computer to it and no codes came up at all what do i do

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6ya6ya
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Posted on Jan 02, 2017

Benimur
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SOURCE: Smog test reject (Nevada)

Hi again,

Good luck with the test.

BTW, appreciate the review of the Live Session.

Cheers.

Posted on Jul 25, 2008

  • 67 Answers

SOURCE: my car dos not pass

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

MacDre2009
  • 13 Answers

SOURCE: Emission system problem

fill your muffler with SOS pads just before your test a wire coat hanger can remove them after the fact..
good luck its how i got my prelude to pass inspection in vancouver bc canada

Posted on Jan 16, 2009

  • 184 Answers

SOURCE: 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.

Posted on Mar 23, 2009

  • 62 Answers

SOURCE: Not ready status on 04 Hyundai Sonata

The not ready may be for a HEATED O2 sensor and HEATED catalyst. Since these cars are not equipped with the HEATED versions, they would never be ready.

Posted on Jan 27, 2010

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1 Answer

Code P0157


OBD II P0157 due to Oxygen Sensor Circuit Low Voltage (Bank 2, Sensor 2)
This code refers to a fault in the post-catalyst o2 sensor on Bank 2. First, a basic run-down of the catalyst: The Catalytic Converter is used to help control tailpipe emissions, to "clean up" the exhaust, if you will. The PCM (Powertrain Control Module) uses the signal from the heated oxygen sensor to the rear of the catalyst to monitor the catalyst's efficiency by comparing it to the o2 sensors in front of the catalyst.

Read more at: http://www.obd-codes.com/p0157
Copyright OBD-Codes.com

P0157 O2 Sensor Circuit Low Voltage

Mar 11, 2016 | 2007 Honda Odyssey

1 Answer

02 sensor not ready,catalyst not ready


The catalyst is able to oxidize hydrocarbons (unburnt fuel) at about 600 degrees. The air injection pump routes fresh air straight to thecat to aid in speeding up the light off time. once there, the cat stays warm enough to oxidize at all times. The oxygen sensors have heater circuits built in (4 wire vs. the earlier 2 wire O2 sensors, this is why they're referred to as HO2S; Heated O2 Sensors) As for the term "Not Ready" this applies to one of the monitors run by the PCM the Emissions Monitor. EGR flow, O2 sensor operation, catalyst temp are all monitored by the PCM so it can decide whether it will run in Open Loop (ignoring O2 sensor inputs) or Closed Loop (adjusting fuel trim by reading the O2 Sensor input) To change a monitor status from "Not Ready" to "Ready" is as simple as driving as per TRIP guidelines. Once a TRIP is completed (a TRIP is an acronym don't remember what it is right now, but a TRIP is different than a drive cycle) then monitors will have completed and be "ready" unless there is a problem in which a DTC will be stored along with freeze frame data (Mode 6) and if enough key cycles for the individual code (Some are instantaneous, some are 3 key cycles, some are 5, and some are successive key cycles), then a MIL or Check Engine Light will turn on as well.
Hope this helps

Mar 08, 2013 | Cars & Trucks

1 Answer

2002 Suzuki esteem 1.8L I/M Readyness not compleeting


It is not how far you drive it is how you drive. Google this to read more about it Google "OBD 2 Drive Cycle"

Oct 15, 2012 | 2002 Suzuki Esteem

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1995 chevy k1500 4.3 5 speed 150,000 stumbles at idle and while driving slow, and even at higher speed while maintaining my speed it will go erratic and smokes black. Have changed map sensor and ignition...


Did you change the TPS - throttle position sensor . Have you check for vacuum leaks . O2 sensor ? videos on youtube on how to test !
GM OBD Trouble Code 44 4 & 6 cylinders ? head gasket Do a compression test on those two cylinders .

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My engine light is on so i took an OBD reading and it showed the error codes P0401, P0420 and P0133. What do I need to fix?


P0401 is EGR valve, low circulation detected.
P0420 Catalyst system.
P0133 is O2 sensor bank 1 sensor 1.
All these codes are emissions related, so i would start with the EGR valve, it's probably clogged with carbon. The catalytic converter could be also, check that for excessive backpressure. The oxygen sensor can be tested, replace if needed. Good luck, i hope this helps.

Jul 29, 2011 | 2000 Honda Prelude

1 Answer

Not ready status on 04 Hyundai Sonata


The not ready may be for a HEATED O2 sensor and HEATED catalyst. Since these cars are not equipped with the HEATED versions, they would never be ready.

Jan 19, 2010 | Hyundai Motor 2004 Sonata

1 Answer

97 Chevy Tahoe, bought used, not sure type Trans, diagnostic code


Number 5 cylinder may have clogged fuel injector. O2 sensor can be replaced on exhaust pipe. EGR valve can also be replaced. good luck

Apr 27, 2009 | 1997 Chevrolet Tahoe

3 Answers

EMISSIONS INSPECTION FAILED


This just means that the OBD was reset recently and the car hasnt been driven enough for readings to be given by the OBDII. Just drive the car a while, and then all should be READY. After any OBDII reset, the car must go through a certain number of "Drive Cycles" before the OBDII will emit any readings. Refer to the manufacturer to find out exactly how many, and how to complete them.

Feb 26, 2009 | 2001 BMW 5 Series

1 Answer

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...


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.

Dec 12, 2008 | Hyundai Sonata Cars & Trucks

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