2001 HYUNDAI ACCENT STALLS ONLY IN COLD WEATHER

The O2 sensor code could be the answer. If the sensor is faulty it could be causing the fuel mixture to be too lean.

Your engine has likely worn out. You are describing the situation when the piston rings are so heavily worn that gas pressure forces itself into the engine sump, pressurizing the lower oil case, and forcing itself into the evaporation system, which then makes its way to the air filter housing.

I advise doing a compression check on the engine at your local garage and repairing or replacing the engine if necessary.

Sounds like a coolant sensor problem. It signals the ECU for open loop, cold start rich, high idle, until warm up is reached.

i think you need to go back to basics.if here is no obd fault codes in the system to give you a clue. then use a multimeter and have a good look at the wiring for corroded connectors etc. including the fuel pump?

You need to check two things.

First, there is a heat shield on top of the front of the motor where the o2 sensor you already replaced is. It's got (4) 12mm bolts. Remove it and check the exhaust manifold (big thing you put the o2 sensor into) for cracks. If there are any cracks, you'll get o2 sensor codes. Replace the manifold.

Second, if the manifold is fine start the car and listen to the exhaust pipe under the engine for leaks. Or if you already know the exhaust is loud... that's gonna do it too. A leaking exhaust pipe on an Accent will set secondary o2 sensor codes.

SHOULD you try to change it yourself, you will need a 7/8" wrench, and a new o2 sensor, or flex pipe, or manifold depending on what's broke. Do NOT touch the tip of the new or old o2 sensor to ANYTHING when you take it out or install it or it will be ruined permanently. Run the car until it's at it's normal operating temperature. Raise the vehicle, and take the o2 sensor out of the car (see below to understand which one) using the 7/8" wrench or if you got fancy and bought an 02 sensor tool... use it.

Replace whatever parts are bad (manifold or pipe) or just replace the sensor you need. Then restart the car and take it to a parts store and have them clear the code. The code (and check engine light) won't return right away, it usually takes a few days. If you did everything right you should be good. If not, it's not a terribly expensive job to have done and by now you should be able to explain to them what's wrong based on what you found when you looked at the car. Just tell them everything you checked and what you saw.

Education: I'm not sure where that half baked answer about o2 sensor 1 being near cylinder one came from but here's the real deal.

Sensor 1 is always BEFORE the catalytic converter
Sensor 2 is always AFTER the catalytic converter

Bank 1 and Bank 2 refer to which SIDE of the exhaust on 6 and 8 cylinder engines. Bank 1 is usually left side, Bank 2 is usually right side.

So... O2 sensor B1S1 refers to the O2 sensor BEFORE the converter on the LEFT side of the motor.

I have a 2001 Elantra, and the Check Engine light keeps coming on. Replaced the o2 sensor, 3 times, and flex pipe was replaced. The engine light came back on...original fault code was P0133............any ideas??

Have someone check the idle sensor. I had to have mine replaced along with another that I don't remember which one is was.

ok when the check engine light comes on that usually indicates a engine malfunction...what you can do is go to your local autozone and they can do an OBDII test for free..my bet says it is the cam or crank sensor.. DO NOT SHUT THE CAR OFF AT AUTOZONE..LOL

HI
when ??
hot or cold engine !!
cold engine :- the problem in (ECT) engine coolant temperature
sensor or lose fuel pressure ??
hot engine :- (CKP) crankshaft position sensor or (ECT) too

explain more details abut your car default
and replay us for more information

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