2011 Infiniti QX56: check engine light

Filed Jul 20, 2026 · Engine · NC

Need to know if there are recalls on the Q56 Infinite for the Catalytic Converter Failure. This truck had 2 and this is the second one that seems to be faulty and the truck only had 162000 miles The 1st one faulted at 151000 2024 The Infinite 2011 Q56 has been known for faulty Catalytic Converter Failure and nothing was done to recall and fix. The truck had 2 Catalytic Converters, the 1st one went out in 2024 @ 152000 miles, now it looks like my engine light is back on with error code P0420 Converter malfunction. I searched internet and it was noted that 2011 have had enormous reports about this issue. This doesn’t make since there is no recall when it is noted that the 2011 Q56 had history of faulty Catalytic Converter Failure. This cost to replace and repair is enormous and this type of part replacement repair should not be happening at 152000-162000 miles. This needs to be investigated and recall issued immediately.

Filed Feb 22, 2022 · Fuel system · 148,000 miles · FL

The contact owns a 2011 Infiniti QX56. The contact stated while driving approximately 25 MPH, the vehicle began to shake and inadvertently stalled. The check engine warning light was illuminated. The vehicle was taken to a local dealer where it was diagnosed with needing the high-pressure fuel tank replaced. The vehicle was repaired however, the failure persisted. The manufacturer was not informed of the failure. The failure mileage was approximately 148,000.

Filed Jan 18, 2022 · Engine · 140,000 miles · TX

The contact owns a 2011 Infiniti QX56. The contact stated while driving at various speeds, the vehicle would vibrate violently. Additionally, the vehicle had experienced intermittent power loss and had gone into limp mode. The contact stated that the check engine warning light was illuminated. The vehicle was taken to a local mechanic where it was diagnosed with needing the timing chain replaced. The vehicle was not repaired. The manufacturer was informed of the failure and informed the contact that the VIN was not included in a recall. The failure mileage was approximately 140,000.

Filed Jan 18, 2021 · Fuel system · 147,032 miles · NJ

While driving my 2011infiniti qx56 to work, the service engine light came on and the vehicle start losing power and shaking.after checking it I had codespoo21,poo87 and poo90. The codes are related to vvt solenoid and high pressure fuel pump.

Filed Jan 15, 2021 · Engine, Transmission · 67,000 miles · TX

Tl* the contact owns a 2011 infiniti qx56. The contact stated while driving 65 MPH, the check engine warning light illuminated. The contact continued driving to his destination. The vehicle was taken to the local dealer southwest infiniti (10495 southwest fwy, houston, tx 77074, (832) 742-1614) where it was diagnosed with needing the catalytic converter to be replaced. The vehicle was repaired however, 3 years later he experienced the failure. The vehicle was taken back to dealer, where it was diagnosed with needing the catalytic converter to be replaced for a second time. The vehicle was not repaired. The manufacturer was informed of the failure. The failure mileage was approximately 67,000.

Filed Sep 27, 2020 · Engine · 69,577 miles · MD

Catalytic converter failure on driver's side resulting in check engine light.

Filed Jan 6, 2020 · Engine · 78,000 miles · NJ

Tl* the contact owns a 2011 infiniti qx56. The contact stated that the check engine warning light illuminated upon start-up. The vehicle was taken to two separate independent mechanics to be diagnosed. The contact was informed of diagnostic trouble codes: p0420- p0430 catalyst system inefficiency. The vehicle was not repaired. A local dealer was not contacted however, the manufacturer was made aware of the failure, case number: 35634299. The approximate failure mileage was 78,000.

Filed Sep 16, 2019 · Fuel system · 89,000 miles · TX

A check engine light (cel) appeared on my 2011 infiniti qx56 at 89k miles. Error is a bad catalytic converter on bank 1. The exact message on odb2 reader is: p0420 catalyst system efficiency below threshold bank 1. This issue just happened after I just replaced a bad o2 sensor after a cel.

Filed Aug 30, 2019 · Fuel system · 102,000 miles · CA

Less than a year after I got the timing debacle fixed, I get a "check engine light" on 2011 qx56. According to my warranty approved mechanic both cats were gone and were not covered. This complaint is the beginning of my goal of getting assurant or infiniti to own this problem since the combined ca and fed cat warranty is 150k miles. My warranty should cover.

Filed Dec 15, 2018 · Fuel system · 83,000 miles · TN

Service engine light on. Both catalytic converters needed replacing at 82,000

Filed Nov 15, 2018 · Engine · 120,000 miles · GA

Tl* the contact owns a 2011 infiniti qx56. When the vehicle was started, an unusual noise was heard from the engine and the check engine indicator illuminated. The vehicle was taken to nalley infiniti marietta (404‑994‑4328, located at 2020 cobb pkwy se, marietta, ga 30060) where it was diagnosed that the timing belt needed to be replaced. The manufacturer was not made aware of the failure. The failure was not repaired. The VIN was not provided. The failure mileage was approximately 120,000.

Filed Oct 26, 2018 · Engine, Fuel system · 126,557 miles · FL

Tl* the contact owns a 2011 infiniti qx56. The contact heard an abnormal noise when the vehicle was being fueled and the check engine warning indicator illuminated. The vehicle was not taken to a dealer or an independent mechanic for diagnostic testing. The vehicle was not repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 126,557.