Question about 1996 Honda Civic

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Oxygen sensor i scanned my car with the obd 2 scanner and it said " oxygen sensor not ready"...what do i do?

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  • blakek Sep 12, 2008

    my obd2 scan result for my 96 honda civic said....

    "oxygen sensor- not ready" and

    "catalyst- not ready"

    how do i fix that problem?



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May have to wait until engine is at operating temp before it will test those components.

Posted on Sep 12, 2008


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Why is oxygen sensor not ready, if I replaced it already, and ran the car for 50 miles?

First--- you look at scan tool data & test parts
BEFORE you replace any

There are many O2 Codes & most sensors have
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to find problems

Evap System, is not the same system, as the Oxygen
Sensor Monitor is on--different codes to work on,
different problem

You have 8 Monitors

So get all your codes & find out what they are & component

OBD Codes have nothing to do with changing parts

They are only an indication of an out of range parameter

Nov 03, 2014 | 2001 Dodge Stratus

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2004 hyundai elantra sedan check engine light on, 1st try at autozone gave P2251 followed by P0420, I reset the car computer to check if it comes back and it did after nearly 100 miles. second try at...

The codes that i have pulled out relates to Oxygen sensor and Catalyst converter faults.
P0420: Catalytic converter system,Bank 1,efficiency
below threshold.
P2251: Heated Oxygen Sensor (H02S)1, Bank 1, negative current control open circuit.
But not necessary the faults. You need to run the scope to see wht patterns u get on the oxygen sensor, and on the obd scanner you may be able to pick up oxygen sensor coming on and going off or rich or lean mixture and the mvolts of the sensor. Also check if the wires are not broken on the sensor. Sometimes a clogged O2 sensor can cause these problems.

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2002 Chevy replaced Egr valve and oxygen sensor 2says not ready for Egr and evap

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The problem is not the parts but the communication between the parts and the computer. I would have the computer reflash and then drive the vehicle for a extended amount of time. This should fix the problem.

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2002 bmw 540i check engine light

Buy an OBD 2 scanner, or a less expensive OBD 2 code reader (OBD means on board diagnostics, 2 means second generation-anything built after 1996, generally). Plug into your car's diagnostic port and read the codes. The trouble codes relay what the computer detected as a problem-points you to a course of action. Whether you fix it yourself or take to a shop with the codes for the repairs.
Many national chains, such as Autozone, will do scans of the engine computer for free, hoping you will return there to buy parts. Be aware a trouble code does not relay a specific course of action-it only points you or a technician to what the computer saw as a problem, like a circuit failure in a sensor signal, it could be the sensor or the wiring associated with it. Common sense and a knowledge of how the many components and sensors work and interact will help one understand and find the problem. For example, a code of a bad oxygen sensor signal-reading too much oxygen in the exhaust-would not be a bad oxygen sensor, but one needs to check why the air-fuel mixture is wrong-too lean-is a vacuum line leaking, or is the fuel pressure too low-these are the types of questions that can arise from a trouble code.
If you want to avoid mechanics entirely, better buy a repair manual and learn all you can about modern engine management electronics.

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monitoring to detect ignition and fuel related misfires that may cause emissions to increase and/or damage to the catalytic converter.

Fuel System Monitoring to detect changes in fuel mixture that may cause emissions to increase.

Comprehensive Component Monitoring to detect any major faults in engine sensors that may cause emissions to increase.
The OBD monitors that only run under certain conditions include the EVAP monitor, HEGO monitor (Heated Exhaust Gas Oxygen sensor), and the Catalyst Efficiency monitor.
Did You Unplug The Battery Both Sides And Let Sit For #0 Minutes? Or Did You Scan With A scanner And Clear The Existing Codes? Most of The Time When You Correct The Issues With Your ECM It Will Clear Up But Just Like A computer You Must Restart It to Make Changes !! Hope This Helps !!
We Are Here To Help !!

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Code p0332 and p0420

16716/P0332 - Knock Sensor 2 (G66): Signal Too Low Possible Symptoms
  • Irregular rpm
  • Drivability problems
  • Loss of power
  • Engine damage
Possible Causes
  • Circuit G66 short to Ground
  • Circuit G66 open
  • G66 improperly torqued
  • G66 damaged
  • Control Module damaged
16804/P0420/001056 - Catalyst System; Bank 1: Efficiency Below Threshold Possible Causes
  • Leakage in Intake and/or Exhaust System
  • Catalyst faulty
  • Oxygen Sensor(s) faulty
  • Oxygen Sensor(s) Control faulty
Possible Solutions
  • Check Intake and Exhaust System for Leaks
  • Check Catalyst
  • Check Oxygen Sensor(s)
  • Check Oxygen Sensor(s) Control
    • Perform Oxygen Sensor(s) Aging Check

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These websites help me a lot. Hope they do the same for you too.

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