What people keep running into with car repair
Complaints tagged car repair, each raised by more than one person. One-off posts are not included.
155 recurring problems · 1368 people · 21 forums we read
Raised more than once
Most people first.
- 3Weird buzzing noise after jump starting a carA buzzing sound often comes from around the radiator fan after a jump start and slows down as the car warms up. This noise can persist and occur right after startup, alongside issues like rough idling.
- 3Control arm won't line up or fit during installationAftermarket suspension parts often fail to line up with mounting holes or feature stiff ball joints that resist installation, leaving beginners stuck for days. Trying to force or trim the component to make it fit only creates dangerous gaps, forcing people to abandon the job and buy parts from a different brand.
- 3Dealership can't figure out why my car won't startMechanics often struggle to diagnose intermittent electrical issues when the dashboard lights up and the vehicle fails to crank. This leaves owners stranded without their car for weeks while the repair shop remains unable to find the root cause.
- 3Car shakes at high speeds even with good tires and alignmentHigh-speed vehicle vibration that persists despite balanced tires and proper alignment is often caused by warped brake rotors, which create a pulsing sensation felt in the seat rather than the steering wheel. This leaves drivers guessing whether the issue stems from rear brakes or other mechanical components like the drivetrain. Without identifying the true root cause, DIYers risk wasting time and money replacing parts prematurely.
- 2Why didn't my mechanic catch a rusted control arm?Structural components like control arms can rust through completely without mechanics flagging the damage during routine inspections, leaving drivers uncertain if their vehicle is safe to drive or worth repairing. This unexpected failure makes it difficult to trust current vehicle assessments and decide whether to invest in keeping the car.
- 2Car shaking and burning smell while drivingA vehicle shaking and emitting a burning or gas smell at highway speeds points to severe mechanical or fuel system malfunctions. Ignoring these symptoms prevents safe operation and can lead to sudden engine failure or fire hazards.
- 2Is a car totaled if the engine moved?An engine shifting out of alignment usually stems from broken engine mounts, throwing off the precise alignment required for surrounding components to function. While it creates severe structural concerns that make the car feel entirely dead to drive, it is mechanically fixable depending on the extent of the underlying damage.
- 2How do you drain oil out of an intercooler?Intercoolers and charge air coolers frequently accumulate pooled oil and oily water that cannot be reached with standard vacuum pumps due to kinks in the boost pipes. This trapped fluid can freeze in cold weather and disrupt normal vehicle operation, such as preventing the car from shifting into higher gears.
- 2Car key stuck in ignition and green flashing lightThe key becomes frozen in the ignition cylinder while still turning partially, often accompanied by a failure to shift out of park and a flashing green immobilizer light. This sudden mechanical jam prevents drivers from removing the key or starting the vehicle entirely.
- 2Battery terminal bolt won't tighten after replacementA stripped, cross-threaded, or melted terminal bolt prevents the clamp from securing properly, which can cause dangerous sparks, melting, and connection failures. Attempting to fix or replace it requires properly disconnecting the battery to avoid electrical hazards.
- 2Is rust under the car hood something to worry about?Unexpected corrosion under the hood usually indicates surface rust caused by moisture, road salt, or aging components, but it requires inspection to ensure it hasn't compromised structural parts or vital wiring. Spotting this can cause anxiety over whether the vehicle is still safe to drive or if the damage is permanent.
- 2Why does my car go into limp mode after warming up?Oil on the ECM plugs can cause a vehicle to repeatedly drop into limp mode a few minutes after warming up while throwing code P1125. This restricts speed to around four miles per hour, leaving drivers uncertain if it is safe to drive to a garage without risking engine damage.
- 2Dashboard lights still on after cleaning battery corrosionCleaning battery corrosion can leave drivers unsure if it is safe to drive and recharge the battery, fearing a potential alternator problem will drain the remaining power. This leaves them questioning whether a negative terminal issue is still affecting the car's electrical power while all the dashboard lights remain on.
- 2Engine replacement vs head gasket repair costA blown head gasket can cost around $1,500 to fix, but severe overheating damage may require a full engine swap jumping the bill closer to $5,000. Deciding between the two depends on whether the underlying block is warped or damaged, forcing car owners to weigh a costly repair against a total replacement before committing funds.
- 2Why is my check engine light on after changing the car battery?Replacing a car battery often clears the computer's memory, which can trigger warning lights or cause the engine to idle roughly while the computer relearns its sensors. This reset frequently masks underlying starting or mechanical issues that were already developing.
- 2Why won't my car window roll up or down?Electric car windows can get stuck completely or only move in one direction, such as going up only after restarting the vehicle. This unreliable behavior leaves vehicles vulnerable and can trap drivers with a window stuck down at night.
- 2AC unit humming with no air coming out of ventsThe system runs or hums while failing to blow any air through the vents. This leaves the space without cooling or airflow, rendering the HVAC system unusable until the airflow issue is resolved.
- 2Why is my AC only blowing out the defroster?The air conditioning system stops flipping through different modes and gets stuck blowing exclusively out of the defroster vents instead of the driver-facing vents. Even moving the actuator linkage pin manually fails to restore airflow or change the vent settings.
- 2Will a missing rear shock dust cover fail inspection?A missing dust cover and bump stop leaves the shock shaft exposed to road debris, grit, and moisture that can ruin the seal and cause premature failure. Because the dust cover clips directly onto the bump stop, both parts are missing together, which often triggers an automatic vehicle inspection failure depending on local regulations.
- 2Cylinder misfire and white smoke from exhaustAn engine misfire persisting on the same cylinder despite replacing spark plugs and checking coils, combined with white exhaust smoke, typically indicates coolant entering the combustion chamber. This can foul the spark plug and lead to ongoing misfires and smoke.
Comes up alongside
Topics that keep appearing on the same problems — not topics with similar names.