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OIs this evap problem a major issue...i replaced all 4 O2 sensors and cleared the more light on. i had the flexible part changed under the car. i can hear some shaking noices but it runs ve

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The Oxygen Sensors are not the same circuit
or Emission Monitor

The Evap System will have to be tested, to
see if there is a problem there

When you come here-- have a year,make,model,
OBD Codes & a complete story, with lots of details,
test results,etc

No idea what has been going on for months & what
has been done & if any testing was done or your
just throwing parts at the unknown

Do Not clear any codes or remove any battery cables,
even after any parts go on

When the Emission Monitors run, the check light will
go off --IF-- the problems are solved

You need all the data in the systems,again,never
clear anything

You can get lots of info with professional tools, that
a code reader can not

If you clear anything,your done & can not work on a
problem, until the monitors run again & your evap monitor
only runs every few days,so now you wait

Posted on Nov 07, 2014

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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

Ok let me start by saying that my 2006 Nissan Altima 2.5 S had a check engine was checked and it came up P0037 bank 1 sensor 2.....and I was told that it was the down stream sensor...I...

You need to find a new shop that can actually diagnose
a vehicles evap system & the emission monitors

You can not do that without professional tools & knowledge

Don't know how many times you need to be told that

The shop you went to isn't doing anything apparently

You have problems to find & resolve & no one else will
give you a different answer, if they even work on vehicles,
or have knowledge of the obd systems & only the pros have
the test equipment needed

Apr 30, 2014 | Cars & Trucks

1 Answer

I have a 2006 Nissan Altima 2.5S I replaced to O2 sensor down stream .....The engine light was on I cleared it but how do I at least clear the evap so I can get an inspection Would disconnecting the...

Inspectors don't look at O2 sensors in VA. Don't worry about it. Take the car to Autozone or Advance Auto and have them use their computer to see why the light is on, and to turn it off. They will do it for free. If your inspector is not letting your car get inspected because of an O2 sensor, take it somewhere else.

Apr 30, 2014 | Cars & Trucks

1 Answer

Check Engine light issues

change the evap sensor the location of the sensor should be on a sticker schematic under your hood

Aug 27, 2012 | Cars & Trucks

1 Answer

What does it mean when code P1133 comes up on your Grand Prix 2004 tes

Hi there:
DTC P1133 - Insufficient switching on Bank1 Sensor1 O2 sensor.

This is the O2 sensor located in the exhaust manifold. The vast majority of the time it is a faulty O2 sensor, but check O2 wiring harness for any chafing, as well as melting(resting on exhaust manifold):


To replace, disconnect the harness connector, and use O2 sensor socket to remove sensor. Once you change it, the code has to be cleared with a scanner. it wont reset itself. Most major parts stores will clear the codes for free. Make sure you get a direct fit O2 sensor. The universal ones that you have to splice into dont work right most of the time. They lose voltage in the wire splice and will reset the code.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Aug 21, 2012 | 2004 Pontiac Grand Prix

1 Answer

I got a 99 s10 that always pops an evap small leak detected code but never ran rough.Now this time the mil light came on I scaned it and its got a p0420 code and its been running rough. i know the cats...

The Cat is good,not if it is 12 years old

Only a select few last 14 years

O2 Sensors should be changed every 100,000 miles

Tune-up --- as in spark plugs?
No tune-up in my world, in the last15 to 20 years

ECM/PCM has been tuning all vehicles since 1980

An EVAP Code for a small leak or any evap issue,
obviously needs to be diagnosed & repaired within
a week,as you should with any OBD Codes,you don't
keep using the vehicle,you fix it

Jul 30, 2011 | 1999 Chevrolet S-10 Pickup

1 Answer

I have a 2002 Montero Sport with a o2 sensor code. I had my neighbor replace the sensor and the check engine light went out, but as soon as I turned the car off and turn it back on the light came back on....

80 % of all O2 Sensor Codes are from Vacuum Leaks
or EVAP System Vacuum problems

Engine misfires also set them, to protect the exhaust converter

Have a repair shop get down to the real issue

Jul 21, 2011 | 2002 Mitsubishi Montero Sport

1 Answer

2 monitors are showing "not

You need to replace your O2 sensor, that should clear pretty fast-does it switch slowly (talking about the upstream O2 sensor)?

-as to the evap, on some cars they won't test unless the tank is between 1/4 and 3/4 full for an extended period of time, but you might just need a gas cap.

Dec 23, 2010 | 2004 Kia Rio

1 Answer

Check engine light on 1997 Honda accord EX


If the engine is running without any problems then The fault code which has flagged the checked engine light will either pertain to the upstream O2 sensor, a drop in catalytic efficiency, an EGR issue, or maybe even an EVAP issue.

A lot of EVAP issues can be resolved by simply ensuring that the fuel filler cap is on securely, otherwise a vacuum leak will be detected in the system and the check engine light will come on.

A drop in catalytic efficiency (P0420) is usually temporary and will stay away after a reset.

EGR issues can sometimes be rectified by removing the EGR valve and cleaning it, and the ports on the intake where it was sat, but there are occasions when it has to be renewed.

The O2 sensor issues are a wee bit different. There are a number of fault codes which relate to the O2 sensor, and which make the O2 sensor look faulty, when the O2 sensor is actually attempting to rectify a problem from elsewhere and isn't faulty at all. However, they could also be due to a fault with the O2 sensor. Basically, further checks should be made before condemning the O2 sensor should the fault code relate to the sensor.

Have a code read done and then have the codes reset and see what comes up.



Jun 23, 2008 | 1997 Honda Accord

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