2006 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated July 2026
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2006 Hyundai Sonata has 3 documented known issues. No issues are rated critical, indicating generally reliable ownership. Across all issues, repair costs range from $90 to $2,500. DIY maintenance guides at au7o.io.
On the 2005-2010 Hyundai Sonata, p0174 (System Too Lean, Bank 2) only applies to the V6 Sonata, since the four-cylinder has a single bank. On the 2.7L Delta (2005) and 3.3L Lambda (2006-2010) V6, this code most often appears alongside P0171 and points to a shared, centrally located vacuum leak — most commonly a failed upper intake manifold (plenum) gasket. When both banks read lean together, the fault is something that affects the whole engine equally: the plenum gasket, a dirty/failing MAF, a cracked PCV hose, or low fuel pressure. A leak isolated to one bank is rarer than the whole-engine plenum leak.
Smoke-test the intake to confirm the plenum gasket leak and replace the upper intake manifold gasket. Simultaneously address any common contributors: clean/replace the MAF, replace cracked PCV hoses, and verify fuel pressure. Reset trims and road-test to confirm both bank trims normalize.
On the 2006-2015 Hyundai Sonata, on the Hyundai Sonata, P0171 (System Too Lean, Bank 1) is most commonly triggered by unmetered air entering downstream of the MAF sensor. The two dominant Sonata-specific sources are a leaking intake manifold gasket and a canister purge valve that sticks open. Because the MAF never counts this extra air, the ECM under-fuels and long-term fuel trims climb past the lean threshold. A dirty MAF hot-wire element is the third common contributor. On V6 Sonatas the upper intake plenum gasket is a known leak point; on the 2.4L four-cylinder a cracked PCV hose or brittle intake gasket is typical.
Perform a smoke test of the intake to pinpoint the leak. Replace the intake manifold/plenum gasket if leaking; replace a stuck-open canister purge (solenoid) valve; clean or replace the MAF sensor; inspect and replace cracked PCV hoses. Clear codes and confirm fuel trims return to near zero after the repair.
On the 2006-2010 Hyundai Sonata 3.3L Lambda V6, p0430 (Catalyst Efficiency Below Threshold, Bank 2) applies only to the V6 Sonata, which has two catalyst banks. On the 2006-2010 Sonata 3.3L Lambda V6 the bank 2 warm-up catalytic converter degrades so the downstream O2 sensor tracks the upstream sensor too closely, indicating the cat can no longer store/convert oxygen efficiently. Age, high mileage, or upstream causes (an exhaust leak or a lazy/failing O2 sensor) accelerate it.
Verify there is no exhaust leak and that both bank 2 O2 sensors are healthy (a failing rear sensor can mimic P0430). If the converter is confirmed inefficient, replace the bank 2 catalytic converter — replacing the O2 sensor alone sometimes clears it but usually the cat must be replaced.
PARKING BRAKE:INDICATOR LIGHT
Hyundai Motor America (Hyundai) is recalling certain 2015-2016 Sonata and Genesis vehicles. In the affected vehicles, the warning light to indicate that the parking brake is applied may intermittently not illuminate in the dash due to corrosion in the switch.
VISIBILITY:SUN/MOON ROOF ASSEMBLY
Hyundai Motor America (Hyundai) is recalling certain model year 2015-2016 Sonata Hybrid vehicles manufactured December 8, 2014, to August 18, 2015, and Hyundai Sonata vehicles manufactured May 28, 2014, to March 18, 2016, equipped with the panoramic sunroof option. Due to a bonding issue with the sunroof wind deflector, the sunroof panel on the affected vehicles may detach while driving.
AIR BAGS:FRONTAL
Hyundai Motor Company (Hyundai) is recalling certain model year 2015-2016 Sonata vehicles manufactured May 29, 2014 to February 11, 2016, 2017 Elantra vehicles manufactured January 12, 2016 to February 22, 2016, and one 2016 Sonata Hybrid vehicle manufactured October 15, 2015. In these vehicles, the driver's frontal air bag may be missing a chemical enhancer required for the second stage air bag deployment, resulting in the second stage not deploying in certain crashes. The primary stage will deploy as intended.
ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
Hyundai Motor America (Hyundai) is recalling certain model year 2015-2016 Sonata vehicles manufactured May 28, 2014, to August 21, 2015. The affected vehicles are equipped with an Antilock Braking System (ABS) warning light intended to warn the driver if there is an ABS malfunction. In the event of an ABS malfunction, the Brake System warning light will illuminate, but the ABS warning light will not illuminate. Since the vehicles have ABS malfunction lights that do not illuminate, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 135, "Light Vehicle Brake Systems."
SEAT BELTS:FRONT:BUCKLE ASSEMBLY
Hyundai Motor America (Hyundai) is recalling certain model year 2015 Sonata vehicles manufactured April 25, 2014, to December 4, 2014. The affected vehicles have a front passenger seat belt whose buckle latch assembly may prevent the front passenger from fastening the seat belt.
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According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2006-2006 Hyundai Sonata has 3 documented issues. The most frequently reported are: P0174 — Bank 2 Lean from Upper Intake Plenum Gasket Leak (V6), P0171 — Bank 1 Lean from Intake Manifold Gasket Vacuum Leak / Stuck Purge Valve, P0430 — Bank 2 Catalytic Converter Efficiency Failure (V6). None are rated critical, but regular maintenance is recommended.
The 2006-2006 Hyundai Sonata has 3 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. No issues are rated critical, suggesting generally good reliability. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
Repair costs for known Hyundai Sonata issues range from $90 to $2,500, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
P0174 (System Too Lean, Bank 2) only applies to the V6 Sonata, since the four-cylinder has a single bank. On the 2.7L Delta (2005) and 3.3L Lambda (2006-2010) V6, this code most often appears alongside P0171 and points to a shared, centrally located vacuum leak — most commonly a… Repairs typically run $250-$650. Severity: medium.
On the Hyundai Sonata, P0171 (System Too Lean, Bank 1) is most commonly triggered by unmetered air entering downstream of the MAF sensor. The two dominant Sonata-specific sources are a leaking intake manifold gasket and a canister purge valve that sticks open. Because the MAF nev… Repairs typically run $90-$550. Severity: medium.
P0430 (Catalyst Efficiency Below Threshold, Bank 2) applies only to the V6 Sonata, which has two catalyst banks. On the 2006-2010 Sonata 3.3L Lambda V6 the bank 2 warm-up catalytic converter degrades so the downstream O2 sensor tracks the upstream sensor too closely, indicating t… Repairs typically run $500-$2,500. Severity: medium.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.
