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The Check Engine light is on. Could this be caused by an oxygen sensor or gas cap?

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Either or could be causing it along with many other possible problems. Iy has been my experience that usually it is the O2 sensor, but I have mainly had GM's

Posted on Jul 29, 2010

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Posted on Jan 02, 2017

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2000 toyota alvalon check engine light keeps coming on for code p0171 after replacing 02 oxygen sensor in bank 1


code p 0171 refers to system too lean bank 1===causes ---intake /exhaust leak---AIR system---MAF/VAF sensor/s---fuel pressure/ pump---injector/s---heated oxygen sensor (HO2S) the one in the exhaust manifold for bank 1 nearest the firewall

Apr 15, 2017 | Toyota Cars & Trucks

Tip

My Engine Check Light Is Illuminated


There's nobody on Fixya who can give you a definitive answer as to why your engine check light is on. It just isn't possible, and nobody will tell you to replace parts because some of the parts can be pricey.

If you can understand a number of the causes that lead to a check light coming on, it will go some way in helping you decide what may be the fault:

The Oxygen Sensor
Often referred to as a Lambda sensor.
An oxygen sensor is fitted on the exhaust system before the catalytic converter. It monitors the unburned oxygen from the exhaust and detects how much fuel is being burned at any given time.
A faulty oxygen sensor means it's not providing the right data to the computer and will cause a drop in miles per gallon. Some cars may have more than one oxygen sensor.

Cause
Over time, the sensor becomes coated by burnt carbon waste from the exhaust and loses its ability to alter the oxygen / fuel mixture for different driving speeds and conditions. A faulty oxygen sensor also increases exhaust emissions.

A failed oxygen sensor can eventually cause the catalytic converter to burn out. The smell of a burnt catalytic converter is likened to the smell of 'tom cat p**s'. A replacement catalytic converter doesn't come cheap.

Mass Air Flow Sensor
The mass airflow sensor tells the car's computer to add the correct amount of fuel based on the amount of air being drawn into the engine for combustion. A faulty mass air flow sensor also affects mpg, increases emissions, and can cause the car to stall.

Cause
Mass airflow sensors can fail over time because of an improperly installed air filter - or an air filter that has never been changed. You should replace the air filter at least once a year to help prevent the airflow sensor from failing.

Spark Plugs
Yes, faulty spark plugs can cause the engine check light to come on - that's because misfiring plugs cause a problem elsewhere in the fuel/air management.
You may feel a 'jolting' when accelerating. Spark plugs fail and there's not much you can do to prevent that from happening.

Fuel Filler Cap
Probably knows as the gas cap in the USA?
Incredibly, an untightened or cracked filler cap can cause problems. Some modern cars even have an error code that suggests a faulty fuel cap.

EGR
The Exhaust Gas Recirculation valve.
In internal combustion engines, exhaust gas recirculation is a nitrogen oxide emissions reduction technique used in petrol/gasoline and diesel engines. An EGR works by recirculating a portion of an engine's exhaust gas back to the engine cylinders. It reroutes some of the exhaust gases which are emitted by the engine into the combustion chambers. This effectively reduces temperatures in the combustion chambers.
Cause
The exhaust gases from the engine can cause the egr plunger (or 'butterfly valve' - which is a small circular disk inside the throttle body) to stick open or closed, leading to differing symptoms such as engine knock when fuel is ignited too early or rough running. It is the engine timing which is affected.

Most EGRs can be removed and cleaned out. Most EGRs are expensive to replace.

Camshaft and/or Crankshaft Sensor
More often than not when these fail the engine will not start, but this isn't always the case nowadays. Some vehicles have a 'limp home' mode. Replacement of the faulty sensor is the only cure.

There's other sensors too. Your car is a veritable network of data being transmitted from/to a whole host of interconnected sensors.

For the home mechanic the most expensive - and frustrating - way of fixing something is to replace one part after the other in the hope that the problem is solved.

Your first course of action should be to have a diagnostic test carried out. Identify the fault first. It's well worth paying a mobile mechanic to carry out a diagnostic test first.

on Feb 08, 2016 | Cars & Trucks

3 Answers

Gas cap code put new one on check egine light still on


could be your oxygen sensor or catalytic converter.. You may check for leaks in manifold as well.Mass air sensor could also be at fault.

Oct 13, 2014 | 2002 Cadillac Deville

2 Answers

P1684 - 1683 - 0135 - 0442 - 0455 error codes


P1684
It is not a fault code per say, it only indicates the battery has been disconnected or went dead in the last 50 drive cycles I believe.
P1683
This code refers to the cruise control speed servo power circuit is open or shorted. The power comes through a normally-on contact in the brake light switch. Use a test light or voltmeter to measure the voltage on the yellow wire / red stripe on the switch. If it's there, measure on the dark blue wire / red stripe. If it's missing there, the switch is defective. The voltage should go to 0 volts there when the pedal is pressed.
The rest of the fault codes are as follows.

P0135 - O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 1
Possible causes- Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit fuse
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit open shorted to ground
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit poor electrical connection
- Faulty Engine Control Module (ECM) Help with thisTech notes The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The control module monitors how long it take the sensor to warm up and start sending an adequate signal. The code is triggered when the sensor is taking too long to warm up. Water getting inside the heated oxygen sensor connector can caused the heated oxygen sensor fuse to blow. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors. If the sensor and connector are OK, replacing the O2 Sensor 1 usually takes care of the problem.

P0442 CHRYSLER - Evaporative Emission Control Small Leak Detected.
Possible causes- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking
P0455 CHRYSLER - EVAP System Large Leak.Possible causes- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking Tech notes The P0455 it's a very common code, because the code is set if the gas cap is loose or missing. Start by tighten the gas cap and clearing the code. In most cases the code can be clear by disconnecting the car battery for about 30 minutes.

Dec 04, 2012 | 2001 Chrysler Town & Country

2 Answers

What does the codes p0442,p0136 &p0141 mean on my 2001 ford taurus it failed inspection for these codes


P0442 FORD - Evaporative Emission System Leak Detected Small Leak

Possible causes- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking
P0136 - O2 Sensor Circuit Malfunction Bank 1 Sensor 2
Possible causes- Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Faulty Rear Heated Oxygen Sensor Bank 1
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks

P0141 FORD - O2 Heater Circuit Bank 1 Sensor 2

Possible causes- Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit fuse
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit open shorted to ground
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit poor electrical connection
- Faulty Engine Control Module (ECM)

Sep 27, 2012 | 2001 Ford Taurus

1 Answer

How to replace oxygen sensor on a 2001 Honda Civic


before you do anything, let the engine and exhaust line cool down first. disconnet the electrical connector to the sensor, spray some lubricating fluid like " WD 40 " to the thread of the sensor, allow for a few minute then use the right spanner to turn the sensor. here you go, the sensor is now removed. Installing a new sensor is just the reverse. Enjoy it.

Apr 10, 2010 | 2001 Honda Civic

2 Answers

2004 colorado code p0172


check your gas cap. If you fill your gas while the vehicle is running, it will also cause your light to come on. Go to OReilys or Autozone and they will shut it off for free and tell you the problem

Jul 25, 2009 | Chevrolet Colorado Cars & Trucks

7 Answers

Check Engine Light Comes on Intermittently


The P0141 code points to the O2 sensor heater circuit. It could be that there is a short in the wiring to the O2 sensor or it could be that the O2 sensor heating element itself is bad. The code is for O2 sensor Bank 1 Sensor 2. Bank 1 means its the O2 sensor connected to the exhaust pipe that runs to cylinder #1. Sensor 2 means that it is likely the O2 sensor after the catalytic converter on the same exhaust pipe.

Dec 31, 2008 | 2004 Honda Accord

1 Answer

Engine light on Infiniti J30


Could be....I would first very simply check the gas cap. A loose or cracked gas cap could cause an O2 (oxygen) sensor to react and light up your "check engine" light. if the cap is indeed tight it may be an actual faulty sensor, in which case I would have your ODB plug under the steering wheel read by the infiniti dealer. Devoe infiniti is great here in Naples, FL!
Hope this helps,
NGK

Aug 22, 2008 | 1997 Infiniti.5 J30

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