Question about 1999 Jeep Cherokee

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Engine light comes on. computer says small emissionss leak but nobody knows where it is

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Who is nobody?
Use the code to diagnose the
Evap System
Have to test the system to find the leak !!!

Posted on Jul 26, 2013


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I have a continuous engine oil leak from the desiel engine of my Merc 320 saloon nobody can pinpoin. Any ideas?

wash the engine and after it's dry, park over some cardboard. look for the area of the leak to start narrowing it down.
Once you figure out what area the leak is roughly coming from, jack the car up and have a closer look.

Jan 02, 2017 | Mercedes-Benz 300-Class Cars & Trucks

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Grand cherokee exhaust manifold leak

A crack in the exhaust manifold will definitely cause the Check Engine light to come on as the O2 sensor is detecting exhaust gasses that have too much oxygen. The computer adjusts the fuel mixture and you end up wasting fuel and burning a lot of it in your catalytic converter (which will eventually clog and fail).

Welding is usually not an option - but if someone will do it and guarantee the work - go for it. Otherwise, this can be a fairly expensive job. Your regular mechanic might be able to do this work - but you may have been luck at an exhaust specialty shop like Midas or Meineke.

Jul 10, 2013 | Cars & Trucks

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Low Fuel Pressure

when check engine light comes on VSC is disabled. small leak is for evaporative system (to prevent fuel vapors from entering the atmosphere) small leak is A leak less than forty thousandths of an inch, it could possibly be a gas cap not fully tightened,leak in a vapor line,leaking fuel filler neck,gas tank leak,purge valve,vent valve just to name afew. clearing code will turn off both lights but if theres a leak lights will come back on.

Apr 05, 2013 | Cars & Trucks

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Have a po442 code that i need to know how to fix.

Simple answer: ALL fault codes are serious enough to worry about and get them fixed.
In the BEST CASE scenario, whatever is causing the code may not be causing any immediate dammage to the vehicle, but it will also put you into the habit of completely IGNORING your check engine light. This will keep you from receiving any warning when a vehicle-damaging fault DOES occur. I have replaced many engines and/or transmissions just because of this.

Just thought I would also mention that in 1999, there are four different Yukon XL's. C1500, K1500, C2500 and K2500. Each of these also have several options available when it comes to engine size (4.8L, 5.3L and 6.0L) and transmission type (4L60E and 4L65E). Some things may apply to one of these that do not apply to the others. It would be helpful if you were to mention which one you have when you ask for help or advice.

With all that said, Diagnostic Test Code (DTC) P0442 is defined by SAE J2012 as "Evaporative Emission System Leak Detected (small leak)"

The code pretty much means what the code decription says. There is a small leak in your evaporative emissions system. This can be a very tough code to properly diagnose for even some well-trained, experienced technicians. The problem with the "small leak" code is that it usually is not detectable by simple visual inspection (as opposed to code P0440, which indicates a large leak).

It will most likely require "smoke-testing" of your EVAP system in order to locate the source of the leak.

Apr 21, 2012 | 2001 GMC Yukon XL

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Started having issues last 2 week where the fuel gauge would just die and then come back on. Yesterday, the check engine light came on and I testerd the computer mod which gave out code of P0442.

P0442 = Evaporative Emission System-Leak detected (small leak)
Go to and register your vehicle by VIN #.. you'll then have access to wiring diagrams, shop manuals, service bulletins, campaigns, illustrations and procedures, etc.
When a 'check engine light' (MIL=Malfunction Indicator Lamp) is turned on, there is a DTC (Diagnostic Trouble Code) set/stored in the ECM/PCM (Engine Control Module/Powertrain Control Module). This code identifies which engine management system component/function experienced a malfunction.
SINCE I don't know which model/year (M/Y) Hyundai vehicle you have, it's difficult to help.

Sep 08, 2011 | Hyundai Santa Fe Cars & Trucks

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I have 2000 chevy impala 3.4 engine i have check engine light with this code p0442 took it it to auto zone they said it was a small leak dont know where to start

This indicates a fuel vapor leak in the EVAP control system. It means a very small leak has been detected. In fact, the leak can be from a hole as small as 0.04" in diameter. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.
code P0442 most likely means one or more of the following has happened:
  • A loose or improperly affixed gas cap
  • A non-conforming gas cap (i.e. not factory/original brand)
  • A small leak/hole in a fuel vapor hose/tube
  • Other small leak in EVAP system
  • Faulty vent o-ring seal
With a P0442, the most common repair is to:
  • Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
  • Otherwise, replace the gas cap, or
  • Inspect the EVAP system for cuts/holes in tubes/hoses

Dec 31, 2009 | Chevrolet Impala Cars & Trucks

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Well, i see a small evap canister leaking under the left rear of the car, i should replace?

Do you have a 'Check Engine' Light ON? Whenever the 'CHECK ENGINE' light comes on, the ECU (Engine Control Unit) sets a Diagnostic Trouble Code (DTC). These codes identify the particular engine management system which caused the light to come on. You'll need to use/find an OBDII (On-Board Diagnostic) Scanner to retrieve any code which have been stored in the ECU computer. Afterward, we might be able to help you DIAGNOSE and perhaps eventually fix the problem.
Regarding the leak you mention, is it a FUEL leak?.. if so, definitely find out what's CAUSING the fuel leak.

Nov 03, 2009 | 2001 Hyundai Elantra

1 Answer

2003 Kia Rio Check Engine Light

Obviously if it is a large evap leak it isn't the gas cap, if your car has an evap canister have someone check this to see that it is operating properly and no leaks at hoses going in and out of it.

Sep 17, 2009 | 2003 Kia Rio

1 Answer

2001 Volkswagen Jetta Check Engine Code PO442

This is an Evaporative Emissions System code - indicates the computer has checked the system and concludes there is a leak in the system (small leak).. could simply be a loose fuel cap.

May 24, 2009 | 2001 Hyundai Santa Fe

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Engine light comes on every 3-4 months: Small Valve Leak Code P___?

something may have. if the problem is fixed, the light goes out after a certain amount of start stop cycles. so the original problem looks like has reaccured since it was never repaird eh? did they say what a "small valve leak" means? is the code still the same? if so, i would say there is a small valve think discnecting the battery for period of time and reconnecting wil reset the computer. this is probably what the shop does anyway and calls it reflash for 140$.

hope this was helpful...............doug

Sep 29, 2008 | 1999 Mazda 626

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