Question about Honda Civic

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I have a honda civic 1993 lsi with high CO emissions level reading at 2.70% and lambda levels are low.please can you give me any advice on correcting these levels for it to pass its MOT. Thanks

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Thanks for that emissionwiz, at idle the emissions are fine .At fast idle they fluctuate. Ive put a new catalisitic converter and lambda sensor on it and still having same problems.How do i find out if there are OBD! codes in the ststem memory

Posted on Oct 29, 2008

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It is running rich. Verify the readings are within specs from the O2 sensors, they should fluctuate up and down once the car is hot, constant high reading is rich run, very low is lean or defective sensors, also clean the throttle body and air-bypass valve, changing the oil can help as well. Do you have any OBD 1 Codes in the system memory?

Posted on Oct 29, 2008

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1 Answer

What does it mean when it says co


CO? That means Carbon Monoxide - it's a rather toxic and poisonous gas emitted from the exhaust system.

When they check emissions on cars CO is one of the gases they measure. If the level is too high .. your car fails the emissions test. I believe in the USA the emissions test is known as the 'smog test'?

If you have a problem with excess CO emissions on a car the cause is often an incorrect fuel/air mixture or a faulty sensor called the lambda/oxygen sensor in the exhaust system

May 12, 2016 | Cars & Trucks

1 Answer

2004 2.0 lt. running very rich


on CO cars, it's below the ECU/PCM
but if you have lambda's, then its not a CO car.
CO cars are missing 02 sensors.
and you said, Sensors, as Plural. got 2?
you failed to post where car is and where it was sold new.
Or VIN.
Engine controls vary by country.
this car may be OEBD type ECU/PCM , "use a scan tool"
and if motor is rich , that can be for 2 reasons.
ENGine is rich
Catalysis dead, or both.
and CO is not HC.
but high CO usually does, give you high CO.

May 31, 2013 | 2004 Suzuki Grand Vitara

2 Answers

Golf 1.4 2003 very high emissions


Replace your oxygen sensors.
murf427

Aug 29, 2012 | 2003 Volkswagen Golf

1 Answer

Hi,i have a honda civic 1.4 ,2005 model and have a noise from drivers sid wheel,i suspect the power steering fluid level is low but i am unable to locate the reservior?


Is the fluid pink to dark red color?

Power steering high pressure hose,low pressure and/or steering rack can be the source of the leak.

Feb 02, 2010 | 2005 Honda Civic

1 Answer

1993 honda civic ex will not pass HC emissions test. Please help


You don't say what state you are in and what the requirements. The early 90s Honda Civics frequently are high on emissions under certain circumstances depending on how the test is run. If you are in a state that allows you to get a waiver with a certain amount of repair - that would be the recommended way to go. A lot of times the amount required is enough to detect the problem, but if not it is basically the cost of keeping the car. I am in Washington State and my 91 Honda Civic runs great and gets 38 mpg but fails the test. I have a new O2 sensor, catalytic converter and distributor and fail. I pay $150 for repairs / waiver every 2 years - and I am an ASE Certified Master Tech. I figure $75 a year saves me a car payment.

Dec 16, 2009 | 1994 Honda Civic

1 Answer

My 1991 4runner failed emissions test with high CO and HC levels.


Not sure, but did you replace the oxygen sensors. Is your catalytic converter still good?

Aug 21, 2009 | 1991 Toyota 4Runner

1 Answer

A/c for honda 2000 blows cold but has erratic high pressure readings very high and very low readings on low side


evacuate system and refill to proper spec for r13a refridgent may not have proper levels. check cooling fan opperation with engine running cooling fan should be opperating while a/c compressor is engaged. if all theese check out good has blockage in system

Jul 31, 2009 | 2000 Honda Civic

2 Answers

Emissions failing with high NOx


Change the lambda/oxygen sensor in the exhaust.

May 21, 2009 | 1994 Mitsubishi Galant

1 Answer

Headlight Adjustment


The adjustment screws/nuts should be located either on the top of the headlamp assembly, behind the headlamp assembly, or near the frame rail by the radiator support.

You will have vertical adjustment screws for each independent beam (separate highs and separate lows, but will be same screw if highs and lows are the same bulb). You may also have additional horizontal adjustment screws as well

Park your car on a level ground 30 feet from a wall and measure the height from the ground to the bulb and mark on a wall (do this for highs beams and low beams if the bulbs are separate, if highs and lows are the same bulb, only do it for the lows)

If the headlights read VOR, then aim the brightest part or cutoff part just below the mark on the wall. If it says VOL or nothing, aim them 2 inches below the mark on the wall.

clockwise is down and counter is up

Mar 22, 2009 | 1998 Honda Civic

1 Answer

Honda civic


check oil level with engine running ,handbrake on and chock the drive wheels ,then drop into reverse and then check oil level DO NOT REV ENGINE WHILST DOING THIS

Nov 20, 2008 | 1993 Honda Civic 4 Door

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