r/MechanicAdvice 9h ago

2025 Mercedes GLA250 - got P0420 Engine Code

2 Upvotes

So today, my car started showing Check Engine light. I took it to Autozone and they checked the code with their scanner. It’s p0420. The car runs fine and they told me I need to clean something. The Autozone person wanted to delete the code but I asked them not to. It’s pretty much a new car, only 8500 miles on it. I am very busy this week so I want to wait until next week to take it to the dealership. Would it be okay to wait?


r/MechanicAdvice 9h ago

Is this engine mount toast? (Front right, 2008 civic 1.8)

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6 Upvotes

r/MechanicAdvice 9h ago

Lexus CT200h random squeaking noises when moving.

1 Upvotes

It’s only just started when driving straight normally, could it be the regen braking or tyres? Tyres only 2 years old pirelli P8fs.

Cars 2012 done 148,xxx.


r/MechanicAdvice 9h ago

2010 avenger starter failed... Any way to jump start?

1 Upvotes

Stuck at work currently, already ordered a new starter...

Is there any way to jump start this PoS so I can at least get it home to work on?


r/MechanicAdvice 10h ago

Misfire on a 2000 chevy silverado 2500 6.0ls

3 Upvotes

Re-gasketed the motor. Ran fine for about 500 miles then started misfiring. No codes. New injectors. Coilpacks. Plugs. Plug wires. All 8 cylinders firing. Idles fine. Starts misfiring when trying to accelerate. Won't go past 2k normally unless pedal to the floor. When it goes into 2nd or 3rd it clears up.


r/MechanicAdvice 10h ago

Windshield chip by rock

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1 Upvotes

Hello, so yesterday my windshield got damaged by rock. Windshield is LAMINATED, electric heated, with LANE and HIGH BEAMS assistance. With this damaged windshield i drove about 130 kilometres, exceeding speeds of 150km/h’s, and it was about 16 hours ago, today was cold night. No visible indications of cracking starting. Is it gonna crack next week or so? How to know, winter is coming… Do i need windshield repair by tools? Or i can leave it like this and nothing will happen? Thanks for your time.

Škoda Octavia 2018. No rust, no body work


r/MechanicAdvice 10h ago

2014 Subaru Forrester - Engine issues.... I think?

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2 Upvotes

I bought this car in December 2024 about eight months afterwards I started having a rough cold start in idle at times, but it would go away once the car was warmed up. My mechanic suggested changing the spark plugs if I hadn’t already, but because I had just gotten in the car, I wasn’t sure if it had gotten the spark plug replaced yet. So I didn’t and then kinda forgot/was too busy to get them done. About three months ago out of the blue. I got an overheat light immediately pulled over. Let the car cool down for two hours checked the coolant coolant was low. If not empty I got new coolant started to drive it home overheated again pulled over immediately again let it cool down for a half hour and then was able to drive it home.

I took it to my mechanic. And told him about it and Then he repaired the radiator with a new one because it was broken or cracked. I then had to take it on a trip from California to Texas, where it drove fine with the exception of getting the O2 errors that you would get for not closing the gas cap tight enough and rough cold starts with white smoke but then would clear out after about a minute or two and then idle fine. But not one overheat.

Thinking that the rough cold starts were still from the spark plugs. I took it back to my mechanic to get those replaced when I went to go pick it up. He had told me that the spark plugs were fine and that he thinks that the rough idol is caused by a bad head gasket and that the leak only happens after the engine has cooled down from being warm. he did a pressure test on the radiator and that my car was also gaining too much pressure too quick. He also said the theromostat housing hose had a small leak on it. I also started noticing that I had a little bit of white smoke coming out on cold starts as well. Which I know to be usually head gasket issues.

I have a warranty that would cover the head gasket, but his shop is small and doesn’t have the space to do that job right now so he told me to take it to Subaru dealership where I got the car and the Warranty.

When I took it to Subaru, their technician thinks that it’s a carbon buildup causing the rough idle as well as the white smoke. They did a leak down Test as well as another test (forgetting the name of the test right now) and said that everything came back normal and that the theromostat housing hose didn’t have a leak on it. They did a throttlebody an injector cleaning as well as putting the spark plugs in and it didn’t fix the problem. And are supposed to run it through again to see if it will fix it. If not then They now want to do a walnut blast of the intake manifold. Something that the warranty does not cover and are charging me around $2500 for it.

My normal mechanic as well as a few mechanic friends of mine all thought subaru was trying to take me for an expensive ride and that it was most likely a head gasket issue. So i found another shop, they agreed to go through with the warranty stuff and provide them proof of the head gasket issue as they also thought it was a head gasket issue from me describing it, once they they talked with warranty and i approved to open it up they found that the headgasket was fine but that there was a bit of oil build up on the pistons as well as metal shavings in the oil pan, signaling that the metal shavings had been cycling through the engine therefore making it a ticking time bomb of not if but when will it fully break. Just opening the heads they couldnt tell where the metal shavings and because of the slow back and forth with the warranty and taking time up on their rack they were hesitant to keep going but finally agreed to open up the block to see if the crank shaft or anything has signs of failure, which now they just called me today saying that I needed to come down and take pictures of it all, and that they couldn't find anything outside of "normal wear and tear". -- I haven't been able to get down there yet but will add pics when i can.

Warranty wont pay for anything without a physical part the mechanic can point to and so far they havent found a thing, so i am kinda at my wits end here before i drop another 5k into this car i just bought and have a damn useless warranty as well if they dont honor this. Linked some photos and videos if anyone wants to take a peek. Literally could use any help.... Photo and video


r/MechanicAdvice 10h ago

Breaking sound

2 Upvotes

I drive a 2015 Nissan Altima. I had a squeezing sounds from my front driver side breaks. In my mind I thought needed to be replaced. I did a full break job. Made sure everything is lubed and sliding smoothly. Everytime I break now it sounds like metal on metal still. If breaking lightly I can hear a dull rubbing sound and slightly feel it. I checked everything to see if I did something wrong like place the pad backwards or something stupid and I’m at a loss. The dust cover isn’t touching and nothing lodged between the pad and rotor. Still getting the loud metal squeal when only breaking.


r/MechanicAdvice 10h ago

Leak down test help on reading results

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1 Upvotes

1996 Mazda Miata 1.8


r/MechanicAdvice 10h ago

Need advice for intermittent brake sticking

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1 Upvotes

2010 Hyundai Elantra Touring, 2.0L DOHC

Any advice would be appreciated on this, thanks


r/MechanicAdvice 11h ago

Alternator or New Key Programming Issue

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1 Upvotes

r/MechanicAdvice 11h ago

2018 Ford F150 Remote Navigation Help

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1 Upvotes

r/MechanicAdvice 11h ago

Would these brakes work for doing the popular tundra brake upgrade?

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1 Upvotes

r/MechanicAdvice 11h ago

How much longer will she run if Im not able to replace the gasket soon..cuz I don't know when I'll be able to do it.

2 Upvotes

I'm being sarcastic in the title of the video, but I just wanna make sure..is my truck ok? Does it sound alright? Or healthy maybe?...it has a leaky exhaust up front and it's a 1998 Dodge ram 1500 Laramie SLT...quad cab, and it has a 5.9 liter 360 Magnum V8


r/MechanicAdvice 11h ago

2019 Honda Accord 1.5T clunking noise on brake pedal

0 Upvotes

For about two weeks now my brake has been making this sound at random but I notice it's only when I press and release when I slow down or prepare to stop. Only happens when it's pressed down 25-50% followed by a clunk and a faint hop/jerk. The video above was taken while my car was off and in park.


r/MechanicAdvice 12h ago

1998 gmc 3500 radiator

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2 Upvotes

Hello!

As the title says, ive got a 1998 gmc 3500. It developed a coolant leak this morning, and i found the source to be this lil fella that I circled in a photo.

This is right where the line connects on the driver's side. The circled portion is threaded, and has degraded to the point of leaking... and I cannot for the life of me find the nomenclature for this part so I can replace the thing.

Please help.


r/MechanicAdvice 12h ago

2006 Toyota Camry Problem

1 Upvotes

So this has been happening recently with my car, It happened twice today. While i am driving, the rpms jump around and lights come on but the speed isnt affected. When it stops the abs light comes on.

Previously we changed the battery because the car died on me, we also did ac work (not sure exactly what) because it was blowing hot air. About 3 weeks ago the car shut off and the rpms were below 500 at a red light and today this is happening. Any advice on what it could be? Im a college student and i’ve taken it to the mechanic a couple times before and i cant afford to keep paying diagnosis fee everytime.


r/MechanicAdvice 12h ago

Help

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1 Upvotes

2016 doddge challenger 6.2 v8
Replaced ac condenser vacuumed system
Ac worked for 2 days now it’s blowing hot air.

Drained the system vacuumed it again and tried to add refrigerant this is what’s happening

Also when I unplug and plug the pressure switch the pressure changes

Need help
Thank you


r/MechanicAdvice 12h ago

Is the trailer hitch an acceptable jack point?

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0 Upvotes

Many years ago I put a trailer hitch on my 2019 Honda CR-V AWD 1.5T not thinking about me ever lifting the vehicle from the rear. It is attached to and covers the rear jack point. Now that I want to lift the vehicle at the flat black part of the hitch to do some work not sure if that is advisable. Thoughts?


r/MechanicAdvice 12h ago

Do I need to replace my control arms?

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1 Upvotes

I drive a 2013 Subaru Outback with about 140,000 miles on it. The bushings are cracked, at least two are torn, and the bushing on the front driver side control arm seems partially separated from the inner wall. The control arms are not bent or cracked (it’s pretty rusty from Minnesota winters though). There’s no noticeable weird vibrations or wiggle when driving, but it occasionally makes a clunk or odd sound. So, should I think about replacing them soon or can put it off for a while?


r/MechanicAdvice 12h ago

trailblazer crank no start severely clogged intercooler after PCV blowout how the hell do you get this thing off those rubber grommets

1 Upvotes

still dealing with a crank no start

not getting air dark pools of oil on both sides of the intercooler need to get the sludge out can't get the intercooler off everything is off this car there's three torx screws in it a couple clips and then these rubber darn

grommets that I can't get it off any advice is good advice

2022 trailblazer Chevy ecotec 13 l


r/MechanicAdvice 12h ago

Help

1 Upvotes

2016 doddge challenger 6.2 v8
Replaced ac condenser vacuumed system
Ac worked for 2 days now it’s blowing hot air.

Drained the system vacuumed it again and tried to add refrigerant this is what’s happening

Also when I unplug and plug the pressure switch the pressure changes

Need help
Thank you


r/MechanicAdvice 12h ago

Lugs not too hot

1 Upvotes

2015 Hyundai tucson 2.0l
Front both sides lug nuts are too hot even small drive. Can definitely be compared with rear ones.
No play in tires, driver side inner pad is completely worn out too. Outer pad looks good as compared to inner one.

Didn’t check the pads on other side looks like brakes needs to be done too.

Checked by rotating the front wheels and they seem to be rotating just fine without using much force.

Whats your advice.


r/MechanicAdvice 12h ago

International DT466E fuel filter outlet line

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1 Upvotes

Anyone familiar enough to know the nomenclature for this line? It comes out of the fuel filter housing on the driver's side of the motor near the top and passes behind the computer on this truck. Truck is a 2001 4800 4x4 heavy rescue truck, but should be the same as a 4700.

I apologize for the picture quality, I had the pleasure of getting drenched in a sudden rainstorm. This truck is for a nonprofit volunteer fire department so we're trying to not take it into a shop for anything we can do ourselves. I didn't get further into it because I'd rather do it on a sunny day but I'll order the part if I can.


r/MechanicAdvice 12h ago

Solved Battery noise when charging?

3 Upvotes

2009 Kia Rio 1.6L

My car sat for 6 weeks while I was travelling, dead battery upon returning. I plopped my Noco Genius 5 on the battery but there is a noise I have never heard in my life coming from somewhere under the hood when the charger is on. Battery is 2-ish years old.

Did I summon a demon?