Q: EVAP Small Leak Code P0442 Lit MIL. Code cleared, has not reappeared. But, Diagnostic tool still shows Emission Related DTC's

asked by on July 19, 2016

The other day, my Check Engine light came on. I used my Diagnostic Tool to check it, and code P0442- EVAP System (Small Leak). I cleared the code, and it has not come back on since (I've probably driven the car 15 times so far). I have a couple small question related to this: 1) could it have been caused by a loose oil filler tube? I was cleaning under the hood and noticed it was loose so I opened the oil cap, jiggled the tube around, then JB-welded it back into firm place. I checked my gas cap and it was closed properly, but I re-sealed it just to be sure. 2) More importantly, every time I have used my diagnostic tool to check the car since, it shows a yellow light and says "Emission Related DTC's" but says no Powertrain DTC's or freeze frame data are present. A few of the monitors are flashing red (EVAP, O2, etc.) and I read that it could be because they havent yet completed their tests. When will it go back to green? All codes were cleared. Does it take a while?

My car has 90000 miles.
My car has an automatic transmission.

Check Engine Light is on Inspection $79.99 - $89.99 Get a Quote

In order for all the monitors to clear you will have to do a lot of driving to see if it clears. The last two to clear take highway driving at a steady speed to clear and may take a couple times to clear or set a code if it cannot pass them after the testing has been done. The oil dipstick tube being loose will not cause the code you had. Keep driving the vehicle normal and it should pass all the monitors soon. I recommend having a qualified technician, such as one from YourMechanic, inspect the codes related to your Check Engine Light and diagnose the relevant systems more thoroughly in person.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

What others are asking

Engine Oil (Not transmission fluid) leak behind the bell housing.

Hi there. The oil pan, oil filter, or the rear main seal (rear crankshaft seal) could be leaking. Check the oil filter and make sure that it is on tight. Then take a socket and wrench and check all of...

Blinking Check Engine Light

As you may know, the Check Engine Light can come on for many different reasons, including for the ignition coils being faulty. Many times, when there are no visible signs or obvious symptoms of the car running poorly, it requires...

Clicking noise from steering wheel

Hello, thanks for writing in. Most of the time this clicking noise is from the column covers rubbing on the steering wheel. I usually remove the covers and drive the vehicle to see if it goes away. If it does...

Crankshaft replacement fit? 2006 Hummer H3

Hello - the crankshaft on the 3.7l LLR engine does in fact have the same stroke as the L52 3.5l engine in your H3, so there is a good chance it is compatible. Check with your Hummer parts specialist for...

Cooling fan not kicking on

The first thing I would do is check to make sure that you have a good ground for the fans, then I would check for voltage output from the relay and then at the fan connector. I would also use...

Hi, I have 2007 mercedes banz and check engine light in my dashboard with a code P0017.

With the code P0017, the crankshaft position sensor is not picking up the engines speed properly. Check the following areas for any issues to fix your P0017 code issue. Check the following: The timing chain could be stretched The...

Check engine light on, temperature goes to hot, noisy engine, car shuddring and turns off.

Fault codes need to be read out from the engine computer. There is a technical service bulletin (TSB) out by Lexus that points to a faulty thermostat causing a Check Engine Light, and that the thermostat should be replaced based...

code P0102, p0300, p1515 Chevy

If these codes, and the reduced power, occurred immediately after the throttle body service, the throttle position sensor outputs should be confirmed. You may see a yellow wire from the throttle body. That wire has been reported to often develop...

P0171 and P0174 codes

For one, these codes are for a lean condition and are not O2 sensor specific codes. It is true that some of the newer Fords have an issue with the purge valve staying on, putting a vacuum on the system...

Related articles

How Do Rain-Sensing Wipers Work?
Several Several decades ago, the only settings windshield wipers came with were low, high, and off. Later, an intermittent wiper feature was integrated into many windshield wiper switches, allowing drivers to reduce the frequency of wiper movements based on the...
Symptoms of a Bad or Failing Throttle/Accelerator Pedal Position Sensor
Common signs of a faulty pedal position sensor include inconsistent engine response, reduced fuel efficiency, and the Check Engine Light coming on.
P2034 OBD-II Trouble Code: Exhaust Gas Temperature Sensor Circuit Bank 2 Sensor 2
P2034 P2034 trouble code definition P2304 is a generic OBD-II diagnostic trouble code (DTC) referencing a malfunction with the exhaust gas temperature (EGT) circuit. This code may be seen with other EGR codes. What the P2034 code means The P2034...