1 exchange-standard reference(s) match the BMW 125i (F20 / F21) 125i 238 hp (175 kW petrol). Output is the deciding criterion: a part meant for another output of the same displacement will not fit.
Engine specification: 1997 cm³, petrol, built from 03/2012 to 12/2019. Matching part number: 49U77-02072 (Mitsubishi). Compare with the code stamped on your part.
Other engines of the BMW 125i (F20 / F21): 125i 224 hp, 125i 218 hp. If the code stamped on your part is legible, search by reference remains the safest route. 24-month warranty.
A remanufactured turbocharger for the BMW Série 1 125i 238 CV starts at €550.00. This engine takes a single reference, 49U77-02072: the price shown is the one part that fits your vehicle, with no variant to compare.
The reference is 49U77-02072. It is what settles the match on a BMW 125i (F20 / F21) with the 125i 238 CV engine — not the vehicle's trade name, nor its year.
Because this engine was built with a single turbocharger. Other Série 1 engines carry several references depending on the production period; here the choice is unique, which rules out any risk of error.
It is on the riveted plate of the centre housing, on the compressor side. The plate holds the marking even on a part coated with oil and soot. It is the only reading that confirms the match with 49U77-02072.
Part 49U77-02072 is sold as an exchange unit: it has already been remanufactured and balanced, and the turbocharger you remove goes back into the reconditioning circuit. Return terms are stated at checkout.
An exchange turbocharger is an original part restored to working order: wear parts are replaced and the rotating assembly is rebalanced. It carries the same reference, 49U77-02072, and fits in place of the part removed.
No: it matches 125i (F20 / F21) models fitted with the 125i 238 CV engine. A 125i (F20 / F21) running on diesel, or at a different petrol power output, takes another reference.
No. Two Série 1 of the same year can take different turbochargers depending on their engine. It is the engine-and-power pairing — here 125i 238 CV — that determines the reference, and the code on the removed part that confirms it.
On this petrol engine, a turbocharger nearing the end of its life shows up as a loss of power under acceleration, smoke at the exhaust, a whistle rising with engine speed and a drop into limp mode. These signs overlap with other intake faults: diagnosis is a job for a qualified technician.
On this 125i 238 CV, the ECU limits the engine when it no longer finds the boost pressure expected for the 238 CV rated output. A turbocharger that no longer regulates pressure correctly is one possible cause, alongside an air leak or a faulty pressure sensor.
On this 125i 238 CV petrol engine, blue smoke means oil is passing, as on a diesel — turbocharger sealing is one candidate among other parts; white smoke points instead to an ignition fault, specific to petrol engines. Colour guides the diagnosis, it does not replace it.
No. The whistle can come from the turbocharger itself, but equally from a leak on an intake hose, the intercooler or the wastegate. Noise alone is not enough to condemn the part.
That depends on the reference fitted from the factory: a twin-scroll turbocharger separates the exhaust flows to limit interference between cylinders, an architecture more common on sporting petrol engines. The listing for reference 49U77-02072 states the architecture used on this 125i 238 CV.
By a fault code read and a boost pressure check, carried out by a qualified technician, before any order of reference 49U77-02072. That check separates a failed turbocharger from an air leak or a faulty sensor — three faults with similar symptoms but different remedies.
Yes: reference 49U77-02072 is the original fitment for a BMW 125i (F20 / F21) with the 125i 238 CV engine. It keeps the dimensions, the mounting and the connections of the part removed. Fitting is a job for a qualified automotive technician.
