Questions tagged [emissions]

The various chemicals emitted in exhaust gasses from an internal combustion engine. The usual gasses which are measured through emissions testing are Nitrogen Oxide (NO2), Carbon Monoxide (CO2), and HydroCarbons (HC).

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Incereased HC in emission test, low CO VW Jetta 1.4 TSI

Yesterday I took my 2008 VW Jetta (1.4 TSI 122ps with 101k km) for annual emissions test. The car passed the test but I noticed that an increment in HC from year to year, especially when idling (...
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6k views

Check emission system displayed on dashboard display

For the last week it has been extremely cold where I live (varies between -27 to -33 degrees Celcius). Is it possible for a fuel cap check valve to freeze open? Last night leaving work the display ...
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28 views

Georgia Emissions Testing Missing Gas Cap “Evap Emission Control Sys Leak Detected (Small Leak)”

I lost the gas cap for my 2008 BMW 328i about a month ago. It took me about a week to get it replaced. During that time, the check engine light for my car lit up. I went out of town right after ...
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130 views

What could be causing High HC GPM, CO GPM, prevent the RPM from going over 4000, and creating an odd exhaust sound?

I have a Toyota Camry 94, it failed its emission test today with 2.62 HC GPM(Limit is 1.2) , 56.87 CO GPM (Limit is 15). The car also won't rev over 4000 RPM and acts as if it has a governor on when ...
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92 Toyota P'up Smog Test Fix?

My'92 Toyota P'up runs great, has had thorough annual maintenance since purchased new, & odometer is now at 166,500 miles. My last smog check indicated that the M1: 15 MPH "HC" (PPM) MEAS was 95, ...
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What does a water like drop coming out of the exhaust of the car signify?

Sometimes while driving in the traffic, I come across a car or two which would be dripping water-like drop from it's exhaust steadily in a break of 4-5 seconds. I tried to ask a couple of people at ...
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23 views

Converting emissions readings between ppm and g/km

Having taken my wife's 20 year old Nissan in for it's MOT test last week, I was looking at the results of the emissions test, and noticed that the Hydrocarbon reading was 6ppm - with a limit of 200. I ...
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91 views

Check engine light : code p0455. Idling below 1,000 rpms losing Acceleration power at times and engine dies randomly

Car is a 2009 Chevy impala. Engine code p0455 is the only code my car shows. I have already had a vent solenoid replaced. It was the one by the gas tank that was about a year ago now. No issues ...
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What could cause high HC and CO, but low NO and CO2 in a smog test

Despite my confidence in having a (relatively) new catalytic converter and a new O2 sensor, my lovely 1994 BMW 325i Convertible got flagged as a "Gross Polluter." The test results are summarized below:...
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CO and Lambda fail after cleaner, air filter and throttle body clean

Went for an MOT, first test failed on high CO AND HC but normal lambda. Got new air filter, cleaned EGR and throttle body and added a cat cleaner into petrol tank. Second MOT failed due to high CO (...
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Can I use a CCTA catalytic converter on a CBFA engine if I live in Georgia?

VW CC 2010 2.0L Turbo (Sport) CBFA SULEV My car is a special variant of the normal VW CCs where instead of the CCTA engine I have the CBFA engine which basically means it has 2 catalytic converters ...
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Emissions check engine light on a Honda Civic

Would a dirty air filter trigger a check engine light "Check Emission System". It is intermittent and seems to come on while driving on the highway when the ambient temp is below 0 C. Any ideas or ...
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Is it possible for an oxygen sensor spacer to cause a car to stall?

VW CC 2010 2.0L CBFA I installed an O2 sensor spacer on my downstream O2 sensor and it seemed to be working for a day. One day later, after the car had cooled down it would rough idle and stall when i ...
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What effect will removing my EGR have?

My 2003 Jetta TDI check engine light recently came on, and a scan by Advance Auto revealed code P0401 -- EGR insufficient flow. I took the vehicle to the local TDI guru, who gave me the option of ...
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118 views

My truck failed emissions because they couldn't find the EGR

I just took my 2011 GMC Silverado 2500 w/Duramax in for an emissions test in Utah County. They do more than just emissions test. They look to make sure all the elements of the emissions system are in ...
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50 views

Anti Pollution Faulty

I have a 2006 Citroen C2 VTS ... At first it did not start and I exchanged the coil pack and the car was fine. Took it out for a test drive a few blocks down the road it cuts out. I switch it off and ...
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P0171 and P0174 in 2008 Range Rover HSE

I have a 2008 Range Rover HSE with 147,000 miles. I got a check engine light and the PID indicated catalytic converters in bank 2 were bad. I replaced the cats and then started getting P0171 and ...
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Catalytic Converter & o2 sensors

My truck..04 Dodge 1500..has 2 cats and 4 sensors. Each has 1 sensor before and 1 after. If I cut out the cat and leave the sensors. Will the computer still code or will it run ok?
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Are there any expected problems when I manipulate the air temperature sensor to show a cooler termperature?

I have a modern motorcycle with fuel injection. It runs lean and especially under 4,000 RPM that is annoying because the engine runs rough. It seem this is a well known problem with modern engines ...
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3answers
12k views

Failed inspection on because of OBD2 readiness

My 2008 Hyundai failed inspection because the OBD-II system is in a "not ready" state. The mechanic asked if my battery had died recently. It had, after getting an alignment. He suggested driving on ...
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PCV Valve hose question

What is a PCV Valve Hose made of? Can any rubber hose replace it? Like the rubber hoses used for gas lines in lawnmowers? Does it need to be made of some type of plastic? From what I understand, the ...
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2004 toyota camry.Failed emission test with Lambda reading of 1.06.appreciate any advise on how to rectify

My 2004 Toyota Camry failed an emission test with a reading of Lambda 1.06 Would appreciate any advice on how to rectify. Austin Rep. of Ireland
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Emissions - High CO reading only

My 1999 Honda CRV has just failed it's UK MOT test on emissions. Results are below: 1st test: CO 0.73 (FAIL - max is 0.30) HC 78 (PASS - max is 200) Lambda 1.008 (PASS - between 0.970 & ...
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Emissions - High CO Reading

My 2004 Volkswagon Polo has just failed its emissions test. It has failed on the CO only, everything else is okay. The results are as follows: Engine/Oil Temperature: 92℃ (720 RPM) Low Idle ...
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What can cause “check gas cap” warnings other than a loose gas cap?

I have a 2006 Saturn Ion, and a few months ago I started getting a warning about my gas cap. Specifically, as I was driving the dash display would beep and say "Check Gas Cap." I bought a new cap to ...
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Water like drop coming out of the exhaust of the car stops? [duplicate]

Earlier, water like drops come out of the exhaust of my car. I searched web, and it shows that its a good sign. But for last few months after a regular maintenance cycle (Oil, Oil Filter, Air Filter, ...
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Emissions Problem: Lambda AND CO Slightly High on my 98 Mazda 626

I just took my 98 Mazda 626 for it's inspection and they said the carbon monoxide is slightly high. The test is done using a tail pipe gas analyzer while holding the RPMs between 2500 - 2800 for ...
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Emissions reading on a 1993 Toyota Corona/Carina E 3SFE 2.0

Are these values normal for a 1993 car? If not, please tell me what should be fixed or replaced. I believe it's running rich based on the lambda value.
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Low idle after adding gasoline

This has happened twice now. My 2000 toyota sienna runs fine until I went to add gasoline. Upon startup, my idle was immediately much lower. I can rev throttle and it sounds smoothly until I release ...
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2012 Mazda 5: P0422 Code

My 2012 Mazda 5 Grand Touring has been having the following problem. Sometimes it takes an extended amount of time to start and other times it will crank normally, but then sputter and stall. When ...
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52 views

Cannot hold constant RPM on Neutral with accelerator pedal

Having Chrysler Town & Country 2008 with 4.0L gasoline engine. Is it normal that i'm not able to keep engine at 2k RPM for 10 seconds? After some seconds, it just climbs itself up to 3k, but i'm ...
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Hi CO Emissions - Kial Soul+ 2.0L

My 2012 Kia Soul+ (53,700 miles) failed the emissions test for high HC and high CO at high RPMs (2500). After a new air filter, spark plugs, a professional injector and throttle body cleaning, the ...
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113 views

What is exhaust gas recirculation?

From what I understand, EGR is used to reduce the temperature of combustion without increasing the amount of fuel injected to reduce NOx emission. This is done by reducing the oxygen percentage ...
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Does anyone know the OEM for the 2006 Infiniti qx56 oxygen sensors

I've got the part numbers and some cross references for the 2006 Infiniti QX56 oxygen sensors, but I would like to buy from the OEM. Bosch? Denso? infiniti front left/right 226937S000 bosch 17204 5 ...
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Car shakes upon startup, dies. Other times gas pedal does not respond

I'm pretty uneducated when it comes cars but im hoping you guys can help me. I have a 99 Ford Ranger that upon startup (not every time) shakes extremely hard and then dies. Other times when driving I ...
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863 views

Difference between fuel injectors and emissions standards

I have a 2004 Honda Accord EX Sedan with a 2.4L I-4 with California emissions and 250k miles on it. I desperately need to replace my fuel injectors but the price is steep! Can someone explain to me ...
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2k views

Is a secondary air injection pump motor necessary?

My check engine light came on and the mechanic said the problem is that the secondary air injection pump motor broke. It's a used car (2004 VW new beetle) with about 150,000 miles on it and the parts ...
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12k views

How to determine if P0430 is O2 or catalytic converter

2009 CTS4 3.6L P0430 catalyst below efficiency bank 2 comes on periodically. (There are no other codes being thrown.) I put a data logger on it today on my drive to work and the rear sensor is ...
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598 views

2006 Hyundai Sonata GLS emissions fail

I own a 2006 Hyundai Sonata GLS 3.3L v6 and recently gave it for some repair work after which the car failed emissions test.The shop told me that the oxygen sensor and Catalyst Monitor are not ready ...
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High CO Emissions

My Yaris is due for an MOT this month. The last MOT report says that CO is right on the limit, everything else is normal HC, Lambda etc., as shown below. The CO has been creeping up every year, and ...
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66 views

Engine grease fell into combustion chamber

I was changing a spark plug out on a 2000 Ford Expedition with a 5.4L Triton, with the coils on the plugs (COP), and I'm worried about how dirty it was. I was being as careful as possible, but I know ...
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47 views

Why are there differences in 2 Smog Check VIRs?

I had 2 Smog Check Vehicle Inspection Reports within a week performed at different stations. I see differences in both the "Inspection Reason" and the "Software Version/EIS Number" plus the "Exhaust" ...
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2k views

How does raw fuel damage the catalytic converter?

I was wondering, if fuel gets in the catalytic converter, how does it damage it?
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175 views

Won't pass emissions, Bad ECU?

So, Last year my 94 Acura Integra AT passed emissions by the skin of its teeth, this year it won't pass, I have noticed in past year and half that dropped from around 30mpg to about 15mpg. Some times ...
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Is it possible for me to see oxygen, caused by valve overlap, in the exhaust gases?

Recently I put my car on the 4 gas analyser, and it gave me these results at idle: CO2: 10.64 % CO: 4.98 % O2: 1.94 % HC: 148 ppm Lambda value: 0.93/13.7AFR I have to mention that it concerns ...
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957 views

How are EVAP system leaks detected by the ECU?

I am curious which sensor(s) detects an EVAP leak and throw error codes, for example: P0442 - EVAP System Leak Detected (small leak) P0455 - EVAP System Leak Detected (large leak) My car is a 2003 ...
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3k views

GM P0420 Code - Eliminating Possible Causes in Chevy G10

I have a 1996 Chevy G10 van with 14X,XXX miles on it. It has the 5.0 engine. I do not have a scanner myself, but, according to a shop, the van was throwing code P0420. According to my research, this ...
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68 views

Why did my smog check cost so much?

I have a 1991 Cadillac Eldorado and had to go to a Star Certified test station for a DMV-required biennial smog check. The technician gave me the price up front and I said that was a lot. He said the ...
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Are riding mowers required to have emissions controls in the US?

I know that regular push mowers are not required to have any sort of emissions controls, so mowing is pretty terrible environmentally. Riding mowers are bigger, and burn more gas, so without any sort ...
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638 views

What formula is used when deriving AFR/lambda value from emissions?

When you get your vehicle hooked up to a gas analser, you'll see the 4 or 5 kinds of emissions you're interested in, and a lambda or AFR value derived from those emission values. I was wondering how ...