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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which of these if not changed can cause increased emissions?

Engine oil, oil filter, Fuel filter, Spark plugs. Have an mot coming up and mechanic was implying emissions could fail if I hadn’t changed Fuel filter and spark plugs. I’m thinking they just might ...
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Inspection Not Ready ( 02, 02 heater, cat)

2006 Ford F150 Battery was unplugged before car was purchased. I bought it and put 300+ miles on it and still see those 3 sensors not ready. No codes. Replace all 02 sensors? Diagnose with mech for ...
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53 views

Will replacing spark plugs fix this? [closed]

My husband and I purchased a 2011 Mazda 6 2-3 months ago. It had 71,000 mi on it when purchased. One accident, but only cosmetic. A few weeks after driving it, I noticed some jerking when coming from ...
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36 views

What is this inlet part on a lawnmower muffler?

I have noticed a small box on the bottom of the muffler on a Mountfield SV150 lawnmower engine. Inside is a reed valve set up as inlet only and a small filter grill. What is the purpose of this part? ...
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Catalytic Converter Clogged, But with what?

So, I've recently replaced my catalytic converter, bank 1 and 2. Both were a pretty penny (About $1,500 Each), I inspected the old catalytic converters and they look to have failed due to being ...
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Volkswagen GTI OBDII Readiness

I have a 2015 Volkswagen GTI SE (2.0T) which is (a little over) due for an emissions test. A few weeks ago I had some rear-end bumper damage repaired, and while in the shop they cleared the trouble ...
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43 views

Can anyone provide documentation for the 2011 chevy cruze eco grill shutters?

I'm trying to understand how they work and where the motor is since I am unable to get the plastic off the bottom of the grill to access them directly. Mine seem to move if I slowly torque them ...
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28 views

Where does California publish vehicle emission standards?

When a vehicle is smog tested in California, several components of its exhaust gas are measured. If the levels of those exhaust gas components are within limits (presumably established by California)...
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2006 Toyota Land Cruiser fails Secondary Airflow Monitor with Hewitt-Tech

I bought a 2006 Land Cruiser from outside California but now need to get it smogged. CA requires all self-checks to pass. It has an "SAIS bypass" system installed from Hewitt-Tech.com. When the smog ...
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1answer
64 views

Over filled oil - 09 Hyundai Elantra

I dropped off my car for an oil change which is an older model, but I always took care of it so it ran great. I listen to the vehicle all the time to ensure nothing seemed off, and no issues. The ...
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54 views

What is CO2 g/km emissions equivalent of Euro 4 petrol standard?

I am trying to find what Euro 4 standard is with regards to CO2 g/km. All I can find is that it is: CO: 1.0g/km THC: 0.10g/km NOx: 0.08g/km This makes no sense to me when trying to compare this to e....
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VW Polo failed NCT on emissions high lambda 1.05

My 2008 VW Polo failed NCT thrice this year for emissions -Lambda high. In the first NCT ( 2900 rpm and Engine temperature - 86C) it had Lambda 1.08 ( Pass Range : Between 0.97 and 1.03). The mechanic ...
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161 views

What should I expect as result of a firmware update fixing NOx emissions in a gasoline engine?

I received an invitation from Peugeot asking me to bring a 2018 naturally aspirated gasoline engine Peugeot 208 (61 kW) to the workshop for a firmware update fixing lamba sensor management which ...
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350 views

Evap System Leak, Repair and Clear Codes to Pass USA State Emission Inspection?

I'm aware of two related issues here Does Check Engine Light Clear Itself... I need the correct 2010 ... drive cycle steps to clear a “Permanent ” P0456 code I've just completed a particularly nasty ...
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114 views

MOT emissions fail

My mini 1.4 petrol has failed on high co and hc but only by a small amount . Last year I gave it a service to pass the emissions but this year it’s not having it. I have fully serviced it, added a ...
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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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70 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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332 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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42 views

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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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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128 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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1answer
374 views

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 CO 0.32 ...
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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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9k views

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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65 views

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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66 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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46 views

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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180 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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3answers
144 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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46 views

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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220 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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80 views

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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1answer
1k views

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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3answers
40k views

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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1answer
82 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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1answer
7k 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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1answer
270 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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2answers
84 views

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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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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37 views

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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879 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 ...
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2answers
1k 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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56 views

Illusive evap code - Hard to find the issue

98 Honda Civic Ex. For a while now my car will throw a p1456 evap code but sometimes it doesn't and the system completes the test. I'll randomly hook up my obd2 scanner and it'll either have a ...
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1answer
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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70 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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82 views

2010 Ford Fusion CARB certification

I have a 2010 Ford Fusion that I will be bringing from Texas to California. Will I need to do any modifications to be CARB certified?
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2k views

Why do tow truck drivers never turn off their engines? [closed]

I was at an outdoor wedding recently and I could hear a truck idling behind the hedges so I went to investigate. It was an AAA tow truck and the driver was filling out paperwork. I explained that a ...
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75 views

Results surprising said lab reporter of emission testing on Toyota Qualis Diesel 4 wheeler on AVL DiTest MDS 205

I got emissions of Toyota Qualis Diesel car tested with the AVL DiTest MDS 205, the result sheet had following columns rpm, temp, secs, CO(%vol.), CO corrected, CO2(% vol.), HC(ppm),HC corrected(ppm),...