P2629 OBD-II Trouble Code: O2 Sensor Pumping Current Trim Circuit / Open Bank 2 Sensor 1

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P2629 code

P2629 is a diagnostic trouble code (DTC) for "O2 Sensor Pumping Current Trim Circuit / Open Bank 2 Sensor 1". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $114.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.0 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford $114.99 $20.0
Toyota $114.99 $20.0
BMW $124.99 $20.0
SCHEDULE P2629 DIAGNOSTIC Get a fair and transparent estimate upfront

P2629 code definition

The P2629 trouble code detects a problem with the voltage signal from the oxygen sensor pumping current trim circuit of sensor 1 in bank 2.

What the P2629 code means

P2629 is a standard OBD-II trouble code for the oxygen sensor pumping current trim circuit, for a specific bank (bank 2, which is the engine bank that does not have the number 1 cylinder) and sensor (1, the upstream sensor). When the oxygen sensor pumping current trim circuit sends a voltage signal to the powertrain control module (PCM) that deviates by more than 10 percent from the standard output, the P2629 code is triggered. This keeps the PCM from sending the correct air and fuel ratios to the engine.

What causes the P2629 code?

The P2629 trouble code can be triggered by a few different things:

  • Malfunctioning oxygen sensor
  • Damaged electrical connectors, faulty wiring, or blown fuses in the oxygen sensor
  • Vacuum leak in the engine
  • Leak from the exhaust system
  • Fuel pressure that is far too low or high
  • In rare cases, a malfunctioning PCM

What are the symptoms of the P2629 code?

When the P2629 trouble code is triggered, the Check Engine Soon Warning Light on the instrument panel will usually be illuminated. The vehicle may also experience worse fuel efficiency, while the engine may run too lean or too rich. The tailpipe is liable to produce extremely dark exhaust.

How does a mechanic diagnose the P2629 code?

The P2629 code will be diagnosed using a normal ODB-II trouble code scanner. A trained technician will observe the freeze frame data from the trouble code scanner to assess the P2629 code and search for additional trouble codes. The mechanic will then reset the trouble codes, restart the vehicle, and take the car for a short test drive to see if the codes resurface. If the trouble codes do not return, the P2629 code was likely be triggered erroneously, though this may suggest a problem with wiring.

If the P2629 code remains, the mechanic will search for issues in and around the oxygen sensor. The connectors, wires, and fuses around the sensor will be checked for damage, and then the sensor will be inspected to see if it is faulty. If no problems are noted with the oxygen sensor, a more thorough inspection will be necessary.

If the oxygen sensor or its components are faulty, the pieces will be replaced, the codes will be reset, and the vehicle will be restarted.

Common mistakes when diagnosing the P2629 code

The most frequent mistake made when diagnosing the P2629 code comes from a failure to follow proper OBD-II trouble code diagnosis protocol. Mechanics should always follow the correct protocol step-by-step to assure that they find the correct issue.

One common mistake comes from simply replacing the oxygen sensor without an inspection to see what the issue may actually be. Mechanics should never assume that the P2629 trouble code means that the upstream oxygen sensor is the problem.

How serious is the P2629 code?

A vehicle with the P2629 code can still be driven. However, the engine will not run properly, as the fuel may be running too rich or too lean. If the car is driven for too long under this condition, serious damage can occur.

What repairs can fix the P2629 code?

The most common fixes for the P2629 code include:

Addition comments for consideration regarding the P2629 code

While the P2629 trouble code directly deals with the upstream trouble code, the downstream trouble code can also be part of the issue.

Need help with a P2629 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

Check Engine Light
trouble codes
P2629

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P2629 code.

SCHEDULE P2629 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(7400)

Rating Summary
6879
249
58
41
173
6879
249
58
41
173
 at YourMechanic

David

13 years of experience
393 reviews
David
13 years of experience
Chevrolet Malibu L4-2.4L - Check Engine Light is on Inspection - Marietta, Georgia
He explained everything to me in detail on what I needed to know about my car. Definitely recommend him for getting the job done.
 at YourMechanic

Raymond

37 years of experience
402 reviews
Raymond
37 years of experience
Toyota Camry L4-2.2L - Check Engine Light is on - Las Vegas, Nevada
Raymond did a great job however I was charged for two hours labor and he was only here less than 45 minutes. should I expect this on future appointments with your mechanic ?
 at YourMechanic

Shane

17 years of experience
217 reviews
Shane
17 years of experience
Volkswagen EuroVan V6-2.8L - Check Engine Light is on Inspection - Austin, Texas
Arrived on time. Explained the issues he found and how he will fix it. I have parts on order and will schedule an appointment to have Shane install the parts when they arrive.
 at YourMechanic

Kanstantsin

19 years of experience
51 reviews
Kanstantsin
19 years of experience
Ford F-150 V8-4.6L - Check Engine Light is on Inspection - Littleton, Colorado
Kanstantsin arrived early. Was very courteous and professional. Will highly recommend to anyone. Thank you Kanstantsin.


More related articles

P0269 OBD-II Trouble Code: Cylinder Number 3 Contribution/Balance Fault
P0269 P0269 code definition Cylinder Number 3 Contribution/Balance Fault What the P0269 code means P0269 is an OBD-II diagnostic trouble code (https://www.yourmechanic.com/article/what-is-the-on-board-diagnostics-obd-system) which indicates that the engine control module (ECM) (https://www.yourmechanic.com/article/what-is-a-vehicle-s-electrical-control-unit) detected the cylinder number 3 having low contribution to...
P2566 OBD-II Trouble Code: Turbocharger Boost Control Position Sensor Circuit Intermittent
P2566 code means the turbocharger boost control sensor reading is incorrect due to problems in the air intake system, or turbo issues.
P0549 OBD-II Trouble Code: Exhaust Gas Temperature Sensor Circuit High Bank 2 Sensor 1
P0549 means the ECM found a fault with the exhaust gas temperature sensor circuit, caused by its damage or related electrical issues.

Related questions

Emission control leak.
This code may be caused by the canister purge solenoid is leaking or you did not tighten the gas cap. Either way the leak should be cleared first and do a physical inspection of the fuel system. Then to check...
Check Engine Light illuminated in car.
The Check Engine Light coming on is to alert the driver that the engine or powertrain is having a problem that it has detected. The light could be something simple like the gas cap was left loose to the engine...
Just got code P0430. How long till catalytic converter fails completely?
Hi, thanks for writing in. This P0430 code (https://www.yourmechanic.com/article/p0430-obd-ii-trouble-code-catalyst-system-efficiency-below-threshold-bank-2-by-spencer-clayton) is for the bank B or driver side converter or the O2 sensor after the converter. The code will need to be diagnosed to isolate the problem to the sensor or...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com